[Tutor] User input
Hi there,
Can anyone tell me how I'm having trouble executing this piece of code:
mpg = raw_input (" Enter your mileage:")distance = raw_input ("Enter your distance:")galon_price = raw_input ("Enter you cost per gallon:")make = "Honda"model = "Accord"##print make, model, "mileage is", mpg, "miles per gallon"print "Total trip cost is US$", distance / (mpg * gallon_price)
I get this error when I run it:
print "Total trip cost is US$", distance / (mpg * gallon_price)TypeError: unsupported operand type(s) for *
Matt
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Re: [Tutor] User input
MATATA EMMANUEL wrote:
> Hi there,
>
> Can anyone tell me how I'm having trouble executing this piece of code:
>
> mpg = raw_input (" Enter your mileage:")
> distance = raw_input ("Enter your distance:")
> galon_price = raw_input ("Enter you cost per gallon:")
> make = "Honda"
> model = "Accord"
> ##
> print make, model, "mileage is", mpg, "miles per gallon"
> print "Total trip cost is US$", distance / (mpg * gallon_price)
>
> I get this error when I run it:
>
> print "Total trip cost is US$", distance / (mpg * gallon_price)
> TypeError: unsupported operand type(s) for *
>
The type which raw_input() returns is a string, so '120'*'5' multiplies
two strings.
Perhaps you can convert your input to a type you need. ( e.g. float ), but you
have to check for a ValueError-Exception if the conversion fails.
HTH Ewald
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Re: [Tutor] User input
raw_input reads in the value as a string, so you need
to convert it at some point to a number. You can
either do this at the point where you read the value
in, or when you do the calculation/print.
To convert it at the input stage (probably the most
logical), add float() such as
mpg = float(raw_input (" Enter your mileage:"))
instead of
mpg = raw_input (" Enter your mileage:")
Or you can do it in the print statement:
print "Total trip cost is US$", float(distance) /
(float(mpg) * float(galon_price))
HTH
--- MATATA EMMANUEL <[EMAIL PROTECTED]> wrote:
-
Hi there,
Can anyone tell me how I'm having trouble executing
this piece of code:
mpg = raw_input (" Enter your mileage:")
distance = raw_input ("Enter your distance:")
galon_price = raw_input ("Enter you cost per gallon:")
make = "Honda"
model = "Accord"
##
print make, model, "mileage is", mpg, "miles per
gallon"
print "Total trip cost is US$", distance / (mpg *
gallon_price)
I get this error when I run it:
print "Total trip cost is US$", distance / (mpg *
gallon_price)
TypeError: unsupported operand type(s) for *
Matt
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Re: [Tutor] User input
You had a typo with the variable 'gallon_price' and your formula for the
total cost was incorrect. Adding float() for the raw_input helps.
This code gets you closer:
mpg = float(raw_input ("Enter your mileage:"))
distance = float(raw_input ("Enter your distance:"))
gallon_price = float(raw_input ("Enter you cost per gallon:"))
make = "Honda"
model = "Accord"
##
print make, model, "mileage is", mpg, "miles per gallon"
print "Total trip cost is US$" , distance * gallon_price/mpg
Others who are more experienced may have suggestions for more elegant code.
Urban Landreman
>From: "MATATA EMMANUEL" <[EMAIL PROTECTED]>
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>Subject: [Tutor] User input
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>
>Hi there,
>
>Can anyone tell me how I'm having trouble executing this piece of code:
>
>mpg = raw_input (" Enter your mileage:")
>distance = raw_input ("Enter your distance:")
>galon_price = raw_input ("Enter you cost per gallon:")
>make = "Honda"
>model = "Accord"
>##
>print make, model, "mileage is", mpg, "miles per gallon"
>print "Total trip cost is US$", distance / (mpg * gallon_price)
>
>
>I get this error when I run it:
>
>print "Total trip cost is US$", distance / (mpg * gallon_price)
>TypeError: unsupported operand type(s) for *
>
>
>
>Matt
>
>___
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Re: [Tutor] User input
Thanks Kelly.
The second version works.
print "Total trip cost is US$", float(distance) /(float(mpg) * float(galon_price))Matt
From: Kelly Vincent <[EMAIL PROTECTED]>To: MATATA EMMANUEL <[EMAIL PROTECTED]>, Tutor@python.orgSubject: Re: [Tutor] User inputDate: Mon, 22 May 2006 15:19:12 +0100 (BST)>raw_input reads in the value as a string, so you need>to convert it at some point to a number. You can>either do this at the point where you read the value>in, or when you do the calculation/print.>>To convert it at the input stage (probably the most>logical), add float() such as>mpg = float(raw_input (" Enter your mileage:"))>instead of>mpg = raw_input (" Enter your mileage:")>>Or you can do it in the print statement:>print "Total trip cost is US$", float(distance) />(float(mpg) *
float(galon_price))>>HTH--- MATATA EMMANUEL <[EMAIL PROTECTED]> wrote:>>->>Hi there,>>Can anyone tell me how I'm having trouble executing>this piece of code:>>mpg = raw_input (" Enter your mileage:")>distance = raw_input ("Enter your distance:")>galon_price = raw_input ("Enter you cost per gallon:")>make = "Honda">model = "Accord">##>print make, model, "mileage is", mpg, "miles per>gallon">print "Total trip cost is US$", distance / (mpg *>gallon_price)>>>I get this error when I run it:>>print "Total trip cost is US$", distance / (mpg *>gallon_price)>TypeError: unsupported operand type(s) for
*>Matt>> > ___> > Tutor maillist - Tutor@python.org> > http://mail.python.org/mailman/listinfo/tutor> >>
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Re: [Tutor] User input
> The second version works. > > print "Total trip cost is US$", float(distance) / > (float(mpg) * float(galon_price)) Hi Matt, Although this works, we'll probably want to do the type conversions as early as possible. We can write a function input_float() that wraps up the float(raw_input()) stuff: ### def input_float(prompt): return float(raw_input(prompt)) ### If we have this as a helper function, then we don't have to worry about sprinkling float() conversions all over the place. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Problem with a class
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Everyone, I am getting an odd traceback when using a class. The class I am using is class TriggerMessage: def __init__(self,data): """ Unpacks the passed binary data based on the MQTCM2 format dictated in the MQ Application Programming Reference """ self.data=data self.structid=None self.version=None self.qname=None self.procname=None self.trigdata=None self.appltype=None self.applid=None self.envdata=None self.userdata=None Self.qmgr=None def decode(self): format='4s 4s 48s 48s 64s 4s 256s 128s 128s 48s' size=struct.calcsize(format) self.structid, self.version, self.qname, self.processname, \ self.triggerdata, self.appltype, self.applid, \ self.envdata, self.userdata, self.qmgr \ = struct.unpack(format,self.data) When I try to reference the class with the following statement: test = TriggerMessage.decode(data) I get the following traceback Traceback (most recent call last): File "m:\mq\mq\scripts\receiver.py", line 238, in ? test = TriggerMessage.decode(data) TypeError: unbound method decode() must be called by TriggerMessage instance as first argument (got str instance instead) Does this make any sense? The variable data passed to the class is valid and is used elsewhere correctly. - -- Thank you, Andrew Robert Systems Architect Information Technologies MFS Investment Management Phone: 617-954-5882 E-mail: [EMAIL PROTECTED] Linux User Number: #201204 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.3 (MingW32) iD8DBQFEcfV4Dvn/4H0LjDwRAo9XAJ4viu2SxR50Mgl4DWucJs0+l84r+gCgkcMy xs+li5sUfKpz1fgAPw5PhuE= =9IHp -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Problem with a class
On Mon, 22 May 2006, Andrew Robert wrote: > class TriggerMessage: > > def __init__(self,data): This suggests that it's to be invoked along the lines of: foo = TriggerMessage(data) > def decode(self): And this as: bar = foo.decode() > test = TriggerMessage.decode(data) I think you wanted something like: test1 = TriggerMessage(data) test2 = test1.decode() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Download file from the web and store it locally.
I need help on this script. I'm trying to download zip file from the web and store it to my local drive: It is printing info, but doesn't download any thing. Can anyone assist here? import urllibimport sys# Get a file-like object from the web and store it locally.url = ""http://www.esri.com">"f = urllib.urlopen(url)# connect to the remotetry: remote = urllib.urlopen(url)except: print "Connot open URL" sys.exit()# Read from the object, storing the page's contents in 's' --> want to download parcels.zip.s = f.read(Parcels.zip)m = "D\\Temp\\file"print remote.info()m = urllib.urlretrieveprint "Download Done"f.close() Thanks ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] help...newbie
Hello, I am pretty sure I am sending this to the right email address. But anyway I need help. I started learning python, and I wanna know how to make a simple program, that displays text and when the user presses enter more text is displayed. And so and so until the end. Thank you, joe. Love cheap thrills? Enjoy PC-to-Phone calls to 30+ countries for just 2¢/min with Yahoo! Messenger with Voice.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
On Mon, 22 May 2006, MATATA EMMANUEL wrote: > import urllib > import sys > # Get a file-like object from the web and store it locally. > url = "http://www.co.rowan.nc.us/enviroservs/downloads.htm"; > f = urllib.urlopen(url) > # connect to the remote > try: > remote = urllib.urlopen(url) > except: > print "Connot open URL" > sys.exit() Don't do this kind of exception handling: it hides information about the exception. If something bad happens, we want to see something other than "Cannot open URL". So instead, let the exception fall through: ### url = "http://www.co.rowan.nc.us/enviroservs/downloads.htm"; f = urllib.urlopen(url) remote = urllib.urlopen(url) ### Or at the very least, modify the exception handler to print out more informative error messages other than "An error happened". We can use the 'traceback' module in the Standard Library to get us more informative error messages. While you're writing simple programs, I'd recommend avoiding exception handlers, just because if something bad happens, we need to preserve all the debugging information we can get. > # Read from the object, storing the page's contents in 's' --> want to > download parcels.zip. > s = f.read(Parcels.zip) What is parcels.zip? I don't understand what this is trying to do yet. At this point, 'f' is a file whose contents contains the stuff in http://www.co.rowan.nc.us/enviroservs/downloads.htm I get the feeling you're thinking like a web browser, in the sense that you need to first visit the page before downloading the file. If so, that's not it. *grin* If the file you're trying to download has a URL like: http://www.co.rowan.nc.us/enviroservs/Parcels.zip then there is no reason to have Python visit the downloads.htm page first: you can go ahead and grab Parcels.zip first, unless the content provider has done something weird to their web server. One other comment: ## m = urllib.urlretrieve ## This won't fire off. In Python, functions that take no arguments still need parens to be called. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem with class - get message that self is not defined
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Everyone, When I try to use the class listed below, I get the statement that self is not defined. test=TriggerMessage(data) var = test.decode(self.qname) I would have thought that self would have carried forward when I grabbed an instance of TriggerMessage. Any ideas on this? The class in question is: class TriggerMessage(object): def __init__(self,data): """ Unpacks the passed binary data based on the MQTCM2 format dictated in the MQ Application Programming Reference """ self.data=data self.structid=None self.version=None self.qname=None self.procname=None self.trigdata=None self.appltype=None self.applid=None self.envdata=None self.userdata=None self.qmgr=None def decode(self): import struct format='4s 4s 48s 48s 64s 4s 256s 128s 128s 48s' size=struct.calcsize(format) self.data=data self.structid, self.version, self.qname, self.processname, \ self.triggerdata, self.appltype, self.applid, \ self.envdata, self.userdata, self.qmgr \ = struct.unpack(format,self.data) - -- Thank you, Andrew Robert Systems Architect Information Technologies MFS Investment Management Phone: 617-954-5882 E-mail: [EMAIL PROTECTED] Linux User Number: #201204 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.3 (MingW32) iD8DBQFEcgK6Dvn/4H0LjDwRArwJAKCVdcpLC7IcUzDaMN+L/hVFv8CToQCaA6hP 0KteYe8olY5/72+uktGRCco= =ToBq -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] OT: any good newsgroup or other forum for MP3 internals discussions?
Terry Carroll wrote: > I apologize for this off-topic question -- the only real connection to > Python is that I'm using Python as my programming language. > > I'm writing a program to analyze an MP3 file's contents. I need to > find a newsgroup or other forum to ask some questions about file > format internals. Nothing's jumping out at me, looking through the > list of usenet newsgroups. > > I've found dozens of sites with relevant specifications, but am looking at > one or two rogue files where either I'm misunderstanding the specs, or the > file is nonconformant (but some MP3 programs can read them, so I'm betting > it's me). Are you using any kind of prefabricated Python module for this? Maybe their implementation of MP3 tagging is enlightening to you. Remember that ID3 in MP3 was a dirty hack at the beginning, so it is likely that may files are nonconformant or that many different programs simply follow their gut, as there was no specification. Hugo ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
Danny, I just made some changes, but I still can't get my file saved on my local drive: here is the new version of the code: ++ import urllibimport sys # Get a file-like object from the web and store it locally. url = ""http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip">http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip"f = urllib.urlopen(url)# connect to the remotetry: remote = urllib.urlopen(url)except: print "Connot open URL" sys.exit()# Read from the object, storing the page's contents in 's'.s = f.read()m = "D\\Temp\\file"print remote.info()m = urllib.urlretrieveprint "Content:"print sprint "Download Done"f.close() ++ It looks like it is almost doing it but I don't know how to correct so far. --Matt:) From: Danny Yoo <[EMAIL PROTECTED]>To: MATATA EMMANUEL <[EMAIL PROTECTED]>CC: Tutor@python.orgSubject: Re: [Tutor] Download file from the web and store it locally.Date: Mon, 22 May 2006 11:29:50 -0700 (PDT)>>>On Mon, 22 May 2006, MATATA EMMANUEL wrote:>>>import urllib>>import sys>># Get a file-like object from the web and store it locally.>>url = "">>f = urllib.urlopen(url)>># connect to the remote>>try:>> remote = urllib.urlopen(url)>>except:>> print "Connot open URL">> sys.exit()>>Don't do this kind of exception handling: it hides information about >the exception.>>If something bad happens, we want to see something other than >"Cannot open URL". So instead, let the exception fall through:>>###>url = "">f = urllib.urlopen(url)>remote = urllib.urlopen(url)>###>>Or at the very least, modify the exception handler to print out more >informative error messages other than "An error happened". We can >use the 'traceback' module in the Standard Library to get us more >informative error messages.>>While you're writing simple programs, I'd recommend avoiding >exception handlers, just because if something bad happens, we need >to preserve all the debugging information we can get.># Read from the object, storing the page's contents in 's' --> want >>to>>download parcels.zip.>>s = f.read(Parcels.zip)>>What is parcels.zip? I don't understand what this is trying to do >yet.>>>At this point, 'f' is a file whose contents contains the stuff in>> http://www.co.rowan.nc.us/enviroservs/downloads.htm>>>I get the feeling you're thinking like a web browser, in the sense >that you need to first visit the page before downloading the file.>>If so, that's not it. *grin*>>If the file you're trying to download has a URL like:>> http://www.co.rowan.nc.us/enviroservs/Parcels.zip>>then there is no reason to have Python visit the downloads.htm page >first: you can go ahead and grab Parcels.zip first, unless the >content provider has done something weird to their web server.>>>One other comment:>>##>m = urllib.urlretrieve>##>>This won't fire off. In Python, functions that take no arguments >still need parens to be called. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem with class - get message that self is not defined
On Mon, 2006-05-22 at 14:28 -0400, Andrew Robert wrote: > When I try to use the class listed below, I get the statement that > self > is not defined. > > test=TriggerMessage(data) > var = test.decode(self.qname) Perhaps var = test.decode() would do what you want. It is not clear why you are trying to use a "qname" argument when decode's only argument is self. test.decode will bind self to the test object. Alan Gauld's web site has a useful discussion of OOP programming. http://www.freenetpages.co.uk/hp/alan.gauld -- Lloyd Kvam Venix Corp ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] help...newbie
Hi Joe, > Hello, I am pretty sure I am sending this to the right email > address. Looks like it :-) > But anyway I need help. I started learning python, How are you learning? Have you found a tutorial yet? If you already know how to program in another language the official tutorial on the python web site is quite good. If you are a complete beginner then the python web site has a page of suggested tutoriuals, including mine. > and I wanna know how to make a simple program, that > displays text and when the user presses enter more text > is displayed. And so and so until the end. Thank you, joe. Any particular text? Or just random letters? Do you mean a paging program like more on Unix? (or type in DOS) Thats a fairly easy project and most of the tutorials should help you write that. nHave a go and if you get stuck tell us what you tried, what went wrong (including any error messages) and we'll try to help out. Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
> I need help on this script. I'm trying to download zip file from the > web and store it to my local drive: It is printing info, but doesn't > download any thing. Looks like you are a wee bit confused on what you are trying to do. > import urllib > import sys > # Get a file-like object from the web and store it locally. > url = "http://www.co.rowan.nc.us/enviroservs/downloads.htm"; > f = urllib.urlopen(url) Here you open a link to the url > # connect to the remote > try: >remote = urllib.urlopen(url) and here you open another to the same url - do you need 2? > # Read from the object, storing the page's contents in 's' --> want > to download parcels.zip. > s = f.read(Parcels.zip) But now you are trying to read from the url, but you pass a variable name (Parcels.zip) which is probably not recognised? If it was a filename it would have quotres around it. But read() doesn't take filenames so thatsd not right either. read() will read the p[age contents of your url back as a string. If the page has a link to Parcels.zip you will have to find it and extract the url for the file - you will probably find it esier to use your browser to do this, with View->source if necessary Then use the actual url to the zip file instead of the html file above. Assuming I've understood what you are trying to do correctly. HTH, Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem with class - get message that self is not defined
(usually best to click reply-All so that the reply goes to the list) On Mon, 2006-05-22 at 15:08 -0400, Andrew Robert wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Well.. inside the class is the decode function. The decode method depends on "data" which is referenced as a global. Perhaps data should be passed into decode as a second argument. My edited version: def decode(self, data): ^^ import struct format='4s 4s 48s 48s 64s 4s 256s 128s 128s 48s' size=struct.calcsize(format) #self.data=data # not needed ^ ^^ self.structid, self.version, self.qname, self.processname, \ self.triggerdata, self.appltype, self.applid, \ self.envdata, self.userdata, self.qmgr \ = struct.unpack(format,data) ^ (removed self.) > > In that function, several variables are defined from a struct unpack. I am suggesting that the data to be unpacked gets passed into the decode method as an argument: test.decode(data) I changed the struct.unpack call to use the data argument. Some additional suggestions: size is never used. perhaps you want: assert size = import struct could be moved to the top of the script and imported once Hopefully this helps. > > What I need is to get those values out. > > How to do that, I am not exactly clear. > > > Andy > > > Python wrote: > > On Mon, 2006-05-22 at 14:28 -0400, Andrew Robert wrote: > >> When I try to use the class listed below, I get the statement that > >> self > >> is not defined. > >> > >> test=TriggerMessage(data) > >> var = test.decode(self.qname) > > > > Perhaps > > var = test.decode() > > > > would do what you want. > > > > It is not clear why you are trying to use a "qname" argument when > > decode's only argument is self. test.decode will bind self to the test > > object. > > > > Alan Gauld's web site has a useful discussion of OOP programming. > > http://www.freenetpages.co.uk/hp/alan.gauld > > > > - -- > Thank you, > Andrew Robert > Systems Architect > Information Technologies > MFS Investment Management > Phone: 617-954-5882 > > E-mail: [EMAIL PROTECTED] > Linux User Number: #201204 > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.3 (MingW32) > > iD8DBQFEcgwoDvn/4H0LjDwRAsUuAJ94rHJbBQVxgHyLYlmi1pAhJzkE1QCfR1xK > sZlx+dHtvaZOOwRpC8tuN6o= > =2Nsp > -END PGP SIGNATURE- -- Lloyd Kvam Venix Corp ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
On Mon, 22 May 2006, MATATA EMMANUEL wrote: > I just made some changes, but I still can't get my file saved on my local > drive: Ok. Up to what part of the program works? Don't just say it doesn't work: can you try isolating what parts are working as expected, and what parts aren't working as expected? Can you at least point at what you see wrong? I do see something weird here, but I want to make sure you can see it too. I guess I'm trying to say: don't use us on Tutor as a simple program or syntax checker. *grin* You should try figuring things out to the best of your abilities too, so that you can learn how to get better. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
Alan, I have changed the code as following but it still printing the contains as something I don't know what it is instead of saving locally! If you click the link in this code, you will see the type of file I would like to be able to download in this script. import urllibimport sys # Get a file-like object from the web and store it locally. url = ""http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip">http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip" # connect to the remotetry: remote = urllib.urlopen(url)except: print "Connot open URL" sys.exit()# Read from the object, storing the page's contents in 's'.s = f.read()m = "D\\Temp\\file"print remote.info()m = urllib.urlretrieveprint "Content:"print sprint "Download Done"f.close() From: "Alan Gauld" <[EMAIL PROTECTED]>To: "MATATA EMMANUEL" <[EMAIL PROTECTED]>,Subject: Re: [Tutor] Download file from the web and store it locally.Date: Mon, 22 May 2006 20:30:47 +0100>>I need help on this script. I'm trying to download zip file from >>the web and store it to my local drive: It is printing info, but >>doesn't download any thing.>>Looks like you are a wee bit confused on what you are trying to do.>>>import urllib>>import sys>># Get a file-like object from the web and store it locally.>>url = "">>f = urllib.urlopen(url)>>Here you open a link to the url>>># connect to the remote>>try:>>remote = urllib.urlopen(url)>>and here you open another to the same url - do you need 2?>>># Read from the object, storing the page's contents in 's' --> want >>to download parcels.zip.>>s = f.read(Parcels.zip)>>But now you are trying to read from the url, but you pass a variable >name>(Parcels.zip) which is probably not recognised? If it was a filename >it would>have quotres around it. But read() doesn't take filenames so thatsd >not>right either.>>read() will read the p[age contents of your url back as a string.>>If the page has a link to Parcels.zip you will have to find it and >extract>the url for the file - you will probably find it esier to use your >browser>to do this, with View->source if necessary>>Then use the actual url to the zip file instead of the html file >above.>>Assuming I've understood what you are trying to do correctly.>>HTH,>>Alan G.>> ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
Danny, This script has to do two things: 1) Hit a site where I would like to download something 2) Read it what the file 3) Download it locally. I'm a beginner, but according to what it is printing I'm thinking it is opening and is able to read the site (I'm wrong since I have been studying Python for the past two weeks). import urllibimport sys # Get a file-like object from the web and store it locally. url = ""http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip">http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip"# connect to the remotetry: remote = urllib.urlopen(url)except: print "Connot open URL" sys.exit()# Read from the object, storing the page's contents in 's'.s = f.read() I'm thinking that up to this level, the script is fine.= m = "D\\Temp\\file"print remote.info()m = urllib.urlretrieve ==> Not sure here print "Content:"print sprint "Download Done"f.close() Matt From: Danny Yoo <[EMAIL PROTECTED]>To: MATATA EMMANUEL <[EMAIL PROTECTED]>CC: Tutor@python.orgSubject: Re: [Tutor] Download file from the web and store it locally.Date: Mon, 22 May 2006 13:05:13 -0700 (PDT)>>>On Mon, 22 May 2006, MATATA EMMANUEL wrote:>>>I just made some changes, but I still can't get my file saved on my >>local>>drive:>>Ok. Up to what part of the program works?>>Don't just say it doesn't work: can you try isolating what parts are >working as expected, and what parts aren't working as expected? Can >you at least point at what you see wrong?>>I do see something weird here, but I want to make sure you can see >it too.>>I guess I'm trying to say: don't use us on Tutor as a simple program >or syntax checker. *grin* You should try figuring things out to the >best of your abilities too, so that you can learn how to get better. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Download file from the web and store it locally.
> I have changed the code as following but it still printing the > contains as something I don't know what it is instead of saving > locally! You need to step back a bit and get a better understanding of variables and functions and how to use them. You are trying to run before you can walk. > import urllib > import sys > > # Get a file-like object from the web and store it locally. > > url = > "http://www.co.rowan.nc.us/enviroservs/planning_data/countyline.zip"; > > > # connect to the remote > try: >remote = urllib.urlopen(url) > except: >print "Connot open URL" >sys.exit() At this stage you have a connection to the zip file. > # Read from the object, storing the page's contents in 's'. > s = f.read() But here you are trying to read from f which doesn't exist! > m = "D\\Temp\\file" And here you assign a filename to m (except the filename is invalid because it doesn't have a colon after the D) > print remote.info() Now this should print some info about your connection > m = urllib.urlretrieve Now you replace the filename with a function from the urllib module. > print "Content:" > print s > print "Download Done" You print out the contents of s which probanly are invalid since f didn't exist. > f.close() And you close f which still doesn't exist. You need to sit down and work through which variables you need and which functions of urllib you need. I suspect you only need to use urllib.urlretrieve() and your total code should only be 3 or 4 lines long. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] help...newbie
> Hey Alan, I have indeed found a tutorial. "A Byte Of Python" Yes, that should be fine for you. > So far it's really good. I'm down around functions, and is this far > enough? I'm not sure which order it covers things but somewhere soon you should find the stuff about reading text from files and you should already know about how to read input from a user and write output to the screen. The next step is to try actually writing the program and see how it goes. It probably won;t work first time, but try to woprk out why and fix it. If you get stuck send a note to the tutor list and someone will help out. > So is that enough to use the python tutorial? A C background would be fine, but since you already have a Byte of Python then stick with it... Alan G. > Alan Gauld <[EMAIL PROTECTED]> wrote: Hi Joe, > >> Hello, I am pretty sure I am sending this to the right email >> address. > > Looks like it :-) > >> But anyway I need help. I started learning python, > > How are you learning? Have you found a tutorial yet? > If you already know how to program in another language > the official tutorial on the python web site is quite good. > > If you are a complete beginner then the python web site has > a page of suggested tutoriuals, including mine. > >> and I wanna know how to make a simple program, that >> displays text and when the user presses enter more text >> is displayed. And so and so until the end. Thank you, joe. > > Any particular text? Or just random letters? > Do you mean a paging program like more on Unix? (or type in DOS) > Thats a fairly easy project and most of the tutorials should help > you write that. nHave a go and if you get stuck tell us what you > tried, what went wrong (including any error messages) and we'll > try to help out. > > Alan Gauld > Author of the Learn to Program web site > http://www.freenetpages.co.uk/hp/alan.gauld > > > > > > - > Be a chatter box. Enjoy free PC-to-PC calls with Yahoo! Messenger > with Voice. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem with class - get message that self is not defined
> When I try to use the class listed below, I get the statement that > self > is not defined. > > test=TriggerMessage(data) > var = test.decode(self.qname) > > I would have thought that self would have carried forward when I > grabbed > an instance of TriggerMessage. self is a special varianble that is only defined inside of a method of an object. It refers to the object itself (hence the name!) Thus you cannot pass self.qname into a method unless you are already inside another object's method. You can read about this in more edetail in the OOP topic of my tutor but I'll try to illustrate here: class C: def method(self,x): self.var = x def g(self, anObj): anObj.f(self.var) class D: def f(self, val): print val c = C() c.method(42) creates an object called c and executes its method with a value of 42. This executes the function C.method(c,42) where self takes the values c and x 42 The end result is that object c has a data member called var with the value 42 d = D() c.g(d) creates a new object d calls the g method of c passing object d as argument executes the function C.g(c,d) where self takes on the value c and anObj takes on d C.g() then calls d.f(self.var) which executes D.f(d,c.var) that is, the self in D.f() is d and the self in C.g() = c I hope that makes sense. Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] IDLE: configuration
Hi, How can I set tab as default indendation for the file editor window in IDLE? I tried to change this in "Configuration Window" and "Apply", but still get 4 spaces. What does work is setting indentation to "8" and then enabling toggle tabs when I open a new window. Thanks, Cecilia ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Calendar Module
Hello, I just got Python In a Nutshell and decided to play around with the time section. While playing with the calendar module, I encountered a problem:>>> import calendar>>> calendar.calendar (2006)' 2006\n\n January February March\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 1 2 3 4 5 1 2 3 4 5\n 2 3 4 5 6 7 8 6 7 8 9 10 11 12 6 7 8 9 10 11 12\n 9 10 11 12 13 14 15 13 14 15 16 17 18 19 13 14 15 16 17 18 19\n16 17 18 19 20 21 22 20 21 22 23 24 25 26 20 21 22 23 24 25 26\n23 24 25 26 27 28 29 27 28 27 28 29 30 31\n30 31\n\n April May June\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 2 1 2 3 4 5 6 7 1 2 3 4\n 3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11\n10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18\n17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25\n24 25 26 27 28 29 30 29 30 31 26 27 28 29 30\n\n July August September\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 2 1 2 3 4 5 6 1 2 3\n 3 4 5 6 7 8 9 7 8 9 10 11 12 13 4 5 6 7 8 9 10\n10 11 12 13 14 15 16 14 15 16 17 18 19 20 11 12 13 14 15 16 17\n17 18 19 20 21 22 23 21 22 23 24 25 26 27 18 19 20 21 22 23 24\n24 25 26 27 28 29 30 28 29 30 31 25 26 27 28 29 30\n31\n\n October November December\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 1 2 3 4 5 1 2 3\n 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10\n 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17\n16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24\n23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31\n30 31\n' >>> I can't seem to figure out how to make it look prettierThanks in advanceMarshall Jiang-- Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. Rick Cook, The Wizardry Compiled ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Calendar Module
On 23/05/06, Shuai Jiang <[EMAIL PROTECTED]> wrote: > Hello, > I just got Python In a Nutshell and decided to play around with the time > section. While playing with the calendar module, I encountered a problem: > > >>> import calendar > >>> calendar.calendar (2006) > ' 2006\n\n January >February March\nMo Tu We Th Fr Sa Su > Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 > 1 2 3 4 5 1 2 3 4 5\n 2 3 4 5 6 7 8 6 7 [...] > I can't seem to figure out how to make it look prettier > Thanks in advance See those '\n' characters? They mean "start a new line" in some contexts (such as text output and graphical editors). You can make python interpret them by asking it to print the output. For example: >>> s = 'Hello\n World!\n-\n --- \n - \n' >>> s 'Hello\n World!\n-\n --- \n - \n' >>> print s Hello World! - --- - >>> Or, you could try typing "print calendar.calendar(2006)" into your console :-) -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] StringIO
Hello list,
I want to use the module StringIO as read and write strings as files, I
looked into document but cannot understand.
Could anyone give me a simple example?
something like:
from StringIO import *
fin = StringIO("abc")
.
How can I used fin?
Thanks,
da
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[Tutor] (no subject)
I am looking for Matthew White. How can I reach him. Jen ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] StringIO
> I want to use the module StringIO as read and write strings as files, I
> looked into document but cannot understand. Could anyone give me a
> simple example?
>
> something like:
> from StringIO import *
> fin = StringIO("abc")
> .
> How can I used fin?
'fin' is a file-like object at this point, so you can do things
like:
fin.read(1)
to get a single byte. The list of things we can do with file-like objects
is here:
http://www.python.org/doc/lib/bltin-file-objects.html
Does this help? Good luck!
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Re: [Tutor] (no subject)
On Mon, 22 May 2006, [EMAIL PROTECTED] wrote: > I am looking for Matthew White. How can I reach him. Hi Jennifer, We probably can not help you much with this. It would help very much if you could somehow explain why you posted this question here on Tutor. It is not obvious how this is related to Python, learning, or programming. This doesn't mean that your question is irrelevant altogether, but only that we don't have much expertise to track this person down for you from the whole entire world. At a whim, I did a google search for "matthew white python". There is a Matthew White that has been answering on Python-Tutor. See: http://aspn.activestate.com/ASPN/Mail/Message/python-Tutor/3115167 I really don't know if this is who you are referring to, but this is the best I can do with my assumptions. Next time, please provide more context here. Good luck to you. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Calendar Module
use print! print calendart.calendar(2006) Alan G. - Original Message - From: "Shuai Jiang" <[EMAIL PROTECTED]> To: Sent: Tuesday, May 23, 2006 2:09 AM Subject: [Tutor] Calendar Module Hello, I just got Python In a Nutshell and decided to play around with the time section. While playing with the calendar module, I encountered a problem: >>> import calendar >>> calendar.calendar(2006) ' 2006\n\n January February March\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 1 2 3 4 5 1 2 3 4 5\n 2 3 4 5 6 7 8 6 7 8 9 10 11 12 6 7 8 9 10 11 12\n 9 10 11 12 13 14 15 13 14 15 16 17 18 19 13 14 15 16 17 18 19\n16 17 18 19 20 21 22 20 21 22 23 24 25 26 20 21 22 23 24 25 26\n23 24 25 26 27 28 29 27 28 27 28 29 30 31\n30 31\n\n April May June\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 2 1 2 3 4 5 6 71 2 3 4\n 3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11\n10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18\n17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25\n24 25 26 27 28 29 30 29 30 31 26 27 28 29 30\n\n July August September\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 2 1 2 3 4 5 6 1 2 3\n 3 4 5 6 7 8 9 7 8 9 10 11 12 13 4 5 6 7 8 9 10\n10 11 12 13 14 15 16 14 15 16 17 18 19 20 11 12 13 14 15 16 17\n17 18 19 20 21 22 23 21 22 23 24 25 26 27 18 19 20 21 22 23 24\n24 25 26 27 28 29 30 28 29 30 31 25 26 27 28 29 30\n31\n\n October November December\nMo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su\n 1 1 2 3 4 5 1 2 3\n 2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10\n 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17\n16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24\n23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31\n30 31\n' >>> I can't seem to figure out how to make it look prettier Thanks in advance Marshall Jiang -- Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. Rick Cook, The Wizardry Compiled ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] StringIO
Danny Yoo wrote:
>> I want to use the module StringIO as read and write strings as files,
>> I looked into document but cannot understand. Could anyone give me a
>> simple example?
>>
>> something like:
>> from StringIO import *
>> fin = StringIO("abc")
>> .
>> How can I used fin?
>
> 'fin' is a file-like object at this point, so you can do things like:
>
> fin.read(1)
>
> to get a single byte. The list of things we can do with file-like
> objects is here:
>
> http://www.python.org/doc/lib/bltin-file-objects.html
>
>
> Does this help? Good luck!
Actually, what I want is creating a kind of file that is just located in
memory not file system.
I want to have a filename for my convert(inputFileName, outputFileName)
How can I get filename?
doing:
fin.name() is impossible!
All above, I want to test it in unittest.
>
>
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