Re: [Tutor] is it possible to traverse two lists simulatenously using python
Kent Johnson wrote: Use zip() or itertools.izip(): And when the sequences are of unequal length: topgirls=["Ann","Mary","Casey","Zoe"] richgirls=["Britt","Susan","Alice"] print "\nUsing zip()" for i,j in zip(topgirls,richgirls): print i,j print "\nUsing map()" for i,j in map(None,topgirls,richgirls): print i,j -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Valloppillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Programming exercise
Daniel Sato wrote: am having some trouble with the first "If" Don't forget the colon at the end of the line. if condition: pass Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Valloppillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] reading complex data types from text file
Chris Castillo wrote:
I don't know how to iterate through all the lines and just get the
integers and store them or iterate through the lines and just get the
names and store them.
You could use the int() function to try to convert a line to an integer,
and if that fails with a ValueError exception, assume that it is a name.
names=[]
numbers=[]
for line in open("mixed.txt"):
try:
nr=int(line)
# it's an integer
numbers.append(line)
except ValueError:
# it's not an integer
names.append(line)
f=open("numbers.txt","wt")
f.write("".join(numbers))
f.close()
f=open("names.txt","wt")
f.write("".join(names))
f.close()
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Re: [Tutor] help
jonathan wallis wrote: i cant figure out if there is a way to make so if one loop ends it says something different than if the other loop ends. Maybe you could use two separate tests and break out of the loop if x or y gets too low. Because the tests are separated you could say something different for each case. For example: import random x=y=9 while True: print "x is %d, y is %d" % (x,y) if x<=0: print "Loop stopped because X was too low" break if y<=0: print "Loop stopped because Y was too low" break # do something with x and y if random.random()>0.5: x-=1 else: y-=1 -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Valloppillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] weather scraping with Beautiful Soup
Che M wrote:
The 60.3 is the value I want to extract.
soup.find("div",id="curcondbox").findNext("span","b").renderContents()
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Re: [Tutor] weather scraping with Beautiful Soup
Che M wrote: Thanks, but that isn't working for me. That's because BeautifulSoup isn't able to parse that webpage, not because the statement I posted doesn't work. I had BeautifulSoup parse the HTML fragment you posted earlier instead of the live webpage. This is actually the first time I see that BeautifulSoup is NOT able to parse a webpage... Greetings, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] weather scraping with Beautiful Soup
Che M wrote:
"http://www.wund.com/cgi-bin/findweather/getForecast?query=Worthington%2C+OH";
>
Any help is appreciated.
That would be:
daytemp = soup.find("div",id="main").findNext("span").renderContents()
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Re: [Tutor] weather scraping with Beautiful Soup
Sander Sweers wrote:
2009/7/18 Che M :
table = soup.find("table","dataTable tm10") #find the table
tbody = table.find("tbody") #find the table's body
You can do this in one step.
tbody = soup.find('tbody')
Yeah, but what if the document contains multiple tables, and you want
explicitely the one with the class 'dataTable tm10'?
In such a case it doesn't hurt to progressively narrow down on the
wanted element.
It also makes the scrape code more robust against page changes. Someone
could add an extra table to the start of the page to host a search box,
for example.
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Re: [Tutor] ok i need some help with a for loop
Skylar Struble wrote: lookwords = ['look', 'examine', 'investigate','open') The ')' probably has to be a ']'. if word and word2 in input1: Try this: if (word in input1) and (word2 in input1): it prints out all of the print things 2 times when i want it to print 1 or the other because what im trying to do is see if the input1 has both an item from items and lookwords in the string and if so print you look in the map or if it finds 1 or none to print sorry you used a word i didnt understand Some interpunction would make this text easier to understand. -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Valloppillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] class attribute to initiate more classes
On 31 Oct 2009, at 06:01 , Vincent Davis wrote: I hope this makes sense, I am sure there is a term for what I am trying to do but I don't know it. What a strange program. But at least it compiles: import random class people: def __init__(self, size): self.size = size class makepeople: def __init__(self, randomsize): self.rsize = randomsize self.allpeople = [] def makethem(self): for x in range(self.rsize): self.allpeople.append(people(self.rsize)) listofp = makepeople(int(random.gauss(100, 2))) listofp.makethem() ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Float number accuracy
On 10-jul-2008, at 22:41, Julia wrote: >>> c = 3.3 >>> c 3.2998 I've done it with and without the c = float and still it rounds the number down. Why? And more importantly: is it possible to make Python more accurate? I need the exact number and not something close to it for my new application. That's because floats have only a fixed amount of bits to represent values, and not all values can be represented exactly, so there occurs some rounding errors. Python can do exact math using the 'decimal' package. See http://www.python.org/doc/2.4.3/lib/module-decimal.html Greetings, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Another assert() question
Dick wrote: > I was hoping to put some sort of explanation of failure in an > assert statement. But how to do it? > So I'd like to know what that 'expression' in the syntax can be, > and how to use it. I think it would help if you separate the detection of duplicate colors from the assert statement. It all looks a bit convoluted now, and I'm missing the context in which this all happens. First detect the presence of duplicate colors in a True/False variable, then use that variable in an assert. Oh, and by the way, you don't have to convert a set to list to be able to take it's length. colors=["red","blue","green","blue","yellow","blue"] duplicatesfound = len(set(colors)) != len(colors) assert not duplicatesfound, "A color has been used more than once" Exercise left for the reader: Report which colors were used more than once. And do me a favor, post in plain text, not HTML. Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Program launcher in taskbar
Ammar wrote... > Is is possible to place my program icon in the system tray portion > of the taskbar (like instant messaging applications)? > The program will be launched by clicking on the icon. How to > do this in python and which module should I use? Are you on a Windows machine? Then you might want to look at the 'win32gui_taskbar.py' example in the 'C:\Ap\Python\Lib\site-packages\win32\Demos' directory. This assumes you have Mark Hammond's "Python for Windows Extensions" installed: http://sourceforge.net/projects/pywin32/ Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] accessing string in list
Bryan wrote...
>I have a list of labels for a data file,
>test = ['depth', '4', '6', '10', '15', '20', '30', '40', 'angle']
>If I have 15.8, I would like to get the index of '20' and '15'. I would
>also like to make sure that my known value falls in the range 4-40.
Python has a standard module 'bisect' for that. To get past the string
trouble, you could convert the array on the fly to floats (without the first
and last label, that is). Why not build your labels as a list with numbers
first, then later add the strings at the beginning and the end? And did you
know that lists can contain both strings and numbers at the same time?
Example:
import bisect
# simple
numbers=[4, 6, 10, 15, 20, 30, 40]
candidate=15.8
print 'insert %g before the %dth element in %s' %
(candidate,bisect.bisect_left(numbers,candidate),numbers)
# complication with strings instead of numbers:
labels=['depth', '4', '6', '10', '15', '20', '30', '40', 'angle']
candidate='15.8'
can=float(candidate)
if can<4 or can>40: raise ValueError('The candidate must be in the range 4-40')
position=bisect.bisect_left([float(x) for x in labels[1:-1]],can)+1
print 'insert %s before the %dth element in %s' % (candidate,position,labels)
prints:
insert 15.8 before the 4th element in [4, 6, 10, 15, 20, 30, 40]
insert 15.8 before the 5th element in ['depth', '4', '6', '10', '15', '20',
'30', '40', 'angle']
Greetings,
--
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the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Vallopillil
http://www.catb.org/~esr/halloween/halloween4.html
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Re: [Tutor] Anyone using tarfile?
Terry wrote... > Well, I've been programming long enough that I tend to assume the > opposite: "I must be doing something wrong." Yes indeed ;-) Don't forget that thousands (if not millions) of individuals all across the internet are using Python and harnessing their collective IQ to squash every bug that occurs. It's simply amazing hard to find a new bug. -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Tree Ctrl Data Structure - Help, please!
Lauren wrote... > Based on some research I've done, I think I want my data structure to > be a series of lists within lists: > [...] > Can someone give me some pointers on how to think about this > clearly?? I'm obviously missing some steps!! :-( I find your example a bit hard to follow. From the node names I can't determine a logical hierarchy; it might be the formatting of the email message. Could you express the way you get your query results in terms of the below geography names? Then maybe I can think up a way how to combine those lists into a tree. # start of example # this example uses a hierarchy of three levels: 1) continent, 2) country/state, and 3) city geo=[ "australia", "europe",[ "spain", "germany", "belgium", ], "america",[ "california",[ "los angeles", "san francisco", "berkeley" ], "texas", "utah" ], "asia" ] print "Our geography as a flat list:\n" print geo def printlist(lst,indent=0): for item in lst: if isinstance(item,(list,tuple)): printlist(item,indent+1) else: print " -> "*indent, item print "\nOur geography as a tree:\n" printlist(geo) # end of example This prints: Our geography as a flat list: ['australia', 'europe', ['spain', 'germany', 'belgium'], 'america', ['california', ['los angeles', 'san francisco', 'berkeley'], 'texas', 'utah'], 'asia'] Our geography as a tree: australia europe -> spain -> germany -> belgium america -> california -> -> los angeles -> -> san francisco -> -> berkeley -> texas -> utah asia -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] How to populate a dictionary
josetjr wrote...
>Hello, I am taking python this summer, and have run into a problem.
Let me suggest some improvements. You can process all the lines in a
textfile like this:
for line in open("dates.txt").readlines():
print line
Furthermore, if you have a string in the form of "ABC=DEF", you can split it
like this:
key,value=s.split("=")
To enumerate the keys of a dictionary in alphabetical order, you can use:
for k in sorted(d):
print k
So, your little homework program becomes more pythonic like this:
history={}
for line in open("dates.txt").readlines():
line=line.strip("\n\"") # clean the line a bit; strip off the newline
and quotes
date,event=line.split("=")
history[date]=event
for k in sorted(history):
print k,history[k]
Have a nice day,
--
"The ability of the OSS process to collect and harness
the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Vallopillil
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Re: [Tutor] Guidance on jump-starting to learn Python
Setve wrote... > I have the challenge / opportunity to learn Python quickly. I > am technically-minded, but I am not a programmer. You have seen the page http://wiki.python.org/moin/BeginnersGuide, and more specific, http://wiki.python.org/moin/BeginnersGuide/NonProgrammers ? Ans of course, you can always ask the mailinglist if you feel that you're hitting a wall ;-) Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] adding a watermark to a sequence of images
Christopher wrote...
> Has anyone used Python to watermark of sequence of images?
No, but I have used PIL (Python Image Library) to do other things to batches
of images, like resizing or printing statistics on it.
Maybe you can get some ideas from these; maybe you can combine them with a
watermarking library.
--- ShowImageDimensions.py
import os,sys,Image
# See http://www.pythonware.com/library/pil/handbook/introduction.htm
def showdimension(filename):
im=Image.open(filename)
print filename,im.size
for infile in os.listdir('.'):
f, e = os.path.splitext(infile)
if (e=='.tga' or e=='.jpg' or e=='.gif' or e=='.bmp'):
showdimension(infile)
--- WoWScreenshotConverter.py
# this converts all TGA's in the current ditectory to JPG's, full-, half-
and small size versions.
# I wrote this in the time when World of Warcraft could not save screenshots
in JPG format.
import os,sys,Image
# See http://www.pythonware.com/library/pil/handbook/introduction.htm
def convert(basename):
print 'Converting',basename
im=Image.open(basename+'.tga')
im.save(basename+'-full.jpg')
# halfsize=tuple(map(lambda x: x/2,im.size))
halfsize=tuple([x/2 for x in im.size])
im.thumbnail(halfsize,Image.ANTIALIAS)
im.save(basename+'-half.jpg')
thumbsize=128,128
im.thumbnail(thumbsize,Image.ANTIALIAS)
im.save(basename+'-small.jpg')
# convert('WoWScrnShot_123005_091926.tga')
for infile in os.listdir('.'):
f, e = os.path.splitext(infile)
if (e=='.tga'):
convert(f)
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the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Vallopillil
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Re: [Tutor] %(value1, value2) what does this returns
Vishwajeet wrote... > I want to know in this % (symbol, stat) returns In itself it returns nothing. The '%' is used as the 'string interpolation operator' here. http://docs.python.org/lib/typesseq-strings.html >>> print "%d kilos of %s for %f euro" % (2,"mangos",3.75) 2 kilos of mangos for 3.75 euro Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] List indexing problem
Mike wrote... >Do you happen to know if there is an efficient way to initialize a list >like this without explicitly writing out each element? >>> temp = [[0, 0, 0],[0, 0, 0],[0, 0, 0]] >>> print temp [[0, 0, 0], [0, 0, 0], [0, 0, 0]] >>> print [[0]*3]*3 [[0, 0, 0], [0, 0, 0], [0, 0, 0]] -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Unable to Reconfigure IDLE
Thomas wrote... >Running IDLE 1.2.2 under MacPython 2.5 on Mac OS X 5.1. > >Configured shell window to wrong size, now can't seem to find the menu >(Options > Configure) to resize the shell. > >Tried going to username > Library > Preferences and removing >org.python* files, but that did not work. IDLE keeps it preferences in a hidden directory '.idlerc' in your home directory. Greetings, -- "The ability of the OSS process to collect and harness the collective IQ of thousands of individuals across the Internet is simply amazing." - Vinod Vallopillil http://www.catb.org/~esr/halloween/halloween4.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Printing the code of a function
wormwood_3 wrote:
> I am wondering if there is a way to
> print out the code of a defined function.
When Python compiles source code, it doesn't store the source code
itself; only the compiled intermediate code. With the 'dis' package you
can disassemble that:
def foo():
print "Show me the money."
import dis
dis.dis(foo)
>>>
2 0 LOAD_CONST 1 ('Show me the money.')
3 PRINT_ITEM
4 PRINT_NEWLINE
5 LOAD_CONST 0 (None)
8 RETURN_VALUE
>>>
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the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Vallopillil
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Re: [Tutor] RE
On 2011-04-06 11:03, JOHN KELLY wrote: I need help. In that case, start with http://wiki.python.org/moin/BeginnersGuide -- "Lots of people have brilliant ideas every day, but they often disappear in the cacophony of life that we muddle through." - Evan Jenkins, http://arstechnica.com/author/ohrmazd/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Titles from a web page
On May 5, 2011, at 07:16, James Mills wrote: > On Thu, May 5, 2011 at 1:52 PM, Modulok wrote: >> You might look into the third party module, 'BeautifulSoup'. It's designed to >> help you interrogate markup (even poor markup), extracting nuggets of data >> based >> on various criteria. > > lxml is also work looking into which provides similar functionality. For especially broken markup you might even consider version 3.07a of BeautifulSoup. The parser in later versions got slightly less forgiving. Greetings, -- "Control over the use of one's ideas really constitutes control over other people's lives; and it is usually used to make their lives more difficult." - Richard Stallman ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to read two files and substitute
On 2011-05-17 15:42, lina wrote:
> I want to get the $4(column 4) value which has the $1 value. for
> values in file2
Have you tried to write some code yourself already? Please show it.
Anyway, I'd proceed with something like this:
mapping={}
for line in open("file1").readlines():
parts=line.strip().split()
mapping[parts[0]]=parts[3]
origs=open("file2").read().split()
print " ".join([mapping[orig] for orig in origs])
The output is "173 174 174". Since you provide no column names I can't
use meaningful variable names. Are these very big files? In that case
another approach is maybe better.
Greetings,
--
"Good programming is not learned from generalities, but by seeing how
significant programs can be made clean, easy to read, easy to maintain
and modify, human-engineered, efficient, and reliable, by the application
of common sense and good programming practices. Careful study and
imitation of good programs leads to better writing."
- Kernighan and Plauger, motto of 'Software Tools'
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Re: [Tutor] how to read two files and substitute
On 2011-05-17 18:47, lina wrote: A further question: I don't know how can I get the final output is unique? Unique in what way? You mean that in file1 (confout.pdb?) there could be more values for the same key? or should duplicate lines in the output be condensed to one line? Maybe if you were more descriptive with what your goal and your source data is, your programming problem is easier to solve. [It could be that you're not comfortable discussing this on a public mailing list, but then, this is python-tutor. If you require hands-on help with complex programming problems in your work field, or even just working solutions, it might be more advantageous to hire me as a remote consultant (€120 per hour) which will enable you to offload difficult programming problems on me, and if you want, I'll throw in some online Python lessons via Skype in as well ;-) ] Greetings, -- "Good programming is not learned from generalities, but by seeing how significant programs can be made clean, easy to read, easy to maintain and modify, human-engineered, efficient, and reliable, by the application of common sense and good programming practices. Careful study and imitation of good programs leads to better writing." - Kernighan and Plauger, motto of 'Software Tools' ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Excited about python
On Jun 10, 2011, at 15:53, Ashwini Oruganti wrote: > You can also try "Learning Python" I also came from a C/C++ background, but I found the standard tutorial sufficient. http://docs.python.org/tutorial/ Greetings, > On Fri, Jun 10, 2011 at 6:11 PM, Kaustubh Pratap chand > wrote: > Hello, > I just joined this mailing list so that i can boost up my learning of > python.I come from a C background so python looks a little strange to me but > it is easier to learn then any other languages around.Yet,i have not been > able to find any cool books on python for peoples who are already > programmers.The ones which i found which i found were quite boring and > exhaustive. > > Can you recommend a book for a person like me which comes with a C background > and the book covers all essential algoithmic methods and examples? > > Thank you. -- "Freedom: To ask nothing. To expect nothing. To depend on nothing." - Ayn Rand ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] html files to pdf document
On Jun 20, 2011, at 18:58, Timo wrote: > On 20-06-11 17:34, arun kumar wrote: >> HI, i have a some 100 plus html individual files.I want to convert them to >> a single pdf document programatically. How to convert them in python. Are >> there any functions,modules or libraries for python to achieve this. > Just a question, but did you use Google before asking here? Because the first > hit when searching for "python html to pdf" looks like it should do what you > want. Maybe for you, but not for the OP. Google will give different search results depending on your location, nationality, IP address and previous searches from that address. Please post the URL of the first hit you got? Greetings, -- "Freedom: To ask nothing. To expect nothing. To depend on nothing." - Ayn Rand ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] html files to pdf document
On Jun 21, 2011, at 00:19, Walter Prins wrote: > For reference, for me the top hit is http://www.xhtml2pdf.com/ which does > indeed look like it might do the job (and is a pure python solution.) I get five SERP pages with tons of Stackoverflow hits, but not one for www.xhtml2pdf.com! I think this is what is known as an Internet Search Bubble. > Another possibly quite relevant link is this one (about 20 lines of code): > http://www.linux.com/learn/docs/ldp/284676-converting-html-to-pdf-using-python-and-qt Thank you for posting the links. Greetings, -- "If you don't know, the thing to do is not to get scared, but to learn." - Ayn Rand ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Can't figure out the syntax error!
On Oct 3, 2011, at 18:50, Joel Goldstick wrote: > But you have some other problems. You keep getting a new random number in > your while loop. Maybe that gives an extra challenge? Guess the random number, which will change after each guess! ;-) Greetings, -- "A creative man is motivated by the desire to achieve, not by the desire to beat others." - Ayn Rand ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] entering text on web site
On Jun 13, 2012, at 14:35, Benjamin Fishbein wrote: > I want to put text in a text box on the webpage, have it entered into the > website, and then get the results. Is there a way to do this with Python? http://wwwsearch.sourceforge.net/mechanize/ is good for this. -- Test your knowledge of flowers! http://www.learn-the-flowers.com or http://www.leer-de-bloemen.nl for the Dutch version. Test je kennis van bloemen! http://www.leer-de-bloemen.nl of http://www.learn-the-flowers.com voor de Engelse versie. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
