Re: [Tutor] print "Hello, World!"
I'd also recommend using http://www.openbookproject.net/thinkcs/python/english2e/ . Currently I am learning from it. Once u are through with it u can read the book called Dive into Python. it's for experienced users. Google it. Hope that helps. On Thu, Feb 3, 2011 at 1:20 PM, wrote: > > Seven years ago, my story was similar. I started off with "The Python Quick > Book" (Manning) and "Python - Visual Quickstart Guide" (Peachpit Press). > Both are very easy to follow. I still pick up the "Quick" book once in a > while for reference. > > This "Tutor" list helped a lot. I learned by trying out the things people > offered as solutions to problems from people like you and me. > > Asking questions here is a way to help a lot of new Python programmers, and > a few older ones, too. > > There are a lot more resources these days, too. Search on "Python" in > YouTube. > > There are a lot of on-line tutorials, too. > > > - Original Message - From: "Doug Marvel" < > smokeinourlig...@gmail.com> > To: > Sent: Wednesday, February 02, 2011 6:00 PM > Subject: [Tutor] print "Hello, World!" > > > Hey folks, >> >> I'm Doug. I've been using computers since second grade, and I know a >> little about them. I am, however, completely new to programming. I >> don't even know what I know about it. I'd like some social interaction >> with this, but I can't go back to school until summer or fall of this >> year. I don't want to wait to start learning this as I feel like I'm >> already about a million years behind. I asked the Oracle >> (www.google.com) and after messing around with the Python Shell and >> getting a lot of error messages, I decided I need some remote help. >> Here's where I'm at: >> >> - I have downloaded and installed Python 2.6.4. Successfully, I think. >> - I am running Windows XP SP3 (though I'm going to see if I can do >> this on my laptop, which has Windows 7) >> - I have toyed around with some tutorials, but all they really taught >> me is that I need a teacher. >> >> I'm sure you guys are busy, but I read that the most basic questions >> are okay. As I'm sure there is at least one good resource on the net >> for people in my position, I'd like some suggestions on where to >> start. I plan on bothering you all as little as possible, but I am >> seriously hoping to make real progress between now and my first class. >> I have a feeling once I get a basic understanding, I'll run away with >> it. It's just very... big right now. So this list seems like a good >> thing, but tell me if I'm in the wrong place. >> >> I am hoping for a link to a somewhat comprehensive online resource >> that explains from the beginning in English, plain English, as this is >> the only language I speak. Something to get my foot in the door would >> be awesome. >> >> >> Cheers, >> Doug Marvel >> ___ >> Tutor maillist - Tutor@python.org >> To unsubscribe or change subscription options: >> http://mail.python.org/mailman/listinfo/tutor >> > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > -- Regards Dharmit Shah ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Recursively flatten the list
Hello, I am learning Python and yesterday I cam across a definition wherein I was supposed to flatten a list recursively. I am getting the solution properly but wanted to know if I can optimize the code further. #!/usr/bin/env python new_list=[] def flatten(num_list): """ >>> flatten([2, 9, [2, 1, 13, 2], 8, [2, 6]]) [2, 9, 2, 1, 13, 2, 8, 2, 6] >>> flatten([[9, [7, 1, 13, 2], 8], [7, 6]]) [9, 7, 1, 13, 2, 8, 7, 6] >>> flatten([[9, [7, 1, 13, 2], 8], [2, 6]]) [9, 7, 1, 13, 2, 8, 2, 6] >>> flatten([[5, [5, [1, 5], 5], 5], [5, 6]]) [5, 5, 1, 5, 5, 5, 5, 6] """ global new_list for i in num_list: if type(i) == type([]): new_list = flatten(i) else: new_list.append(i) tmp = new_list new_list=[] return tmp if __name__=="__main__": import doctest doctest.testmod() PS - My knowledge of Python is still very basic and I am trying to dive into it as deeper as I can. Solutions on Stackoverflow.com were beyond my understandability. -- Regards Dharmit Shah ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Web Programming
Hi all, I have been reading Head First Python<http://www.headfirstlabs.com/books/hfpython/> since some time now. I am stuck in a chapter on Web Development. Web Development has never been an area of my interest and hence I feel stuck in there. If anyone here has read the book, I wish to know if it's okay to skip that chapter and read further? -- Regards Dharmit Shah <http://about.me/dharmit> ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] How to replace the '\'s in a path with '/'s?
Ruchard,
Try return path.replace('\\', '/'). That gave me the output desired by you.
I don't know the reason. But I guess it's because \ is used as escape
character. I am sure someone in the list will point out the accurate reason.
On Sun, Jul 31, 2011 at 10:58 AM, Richard D. Moores wrote:
> 64-bit Vista
> Python 3.2.1
>
> I would like to write a function that would take a path such as
> 'C:\Users\Dick\Desktop\Documents\Notes\College Notes.rtf'
> and return 'C:/Users/Dick/Desktop/Documents/Notes/College Notes.rtf' . I've
> tried this:
>
> def test(path):
>return path.replace('\', '/')
>
> print(test('C:\Users\Dick\Desktop\Documents\Notes\College Notes.rtf'))
>
> gets me
>
> File "c:\P32Working\untitled-5.py", line 2
>return path.replace('\', '/')
>^
> SyntaxError: EOL while scanning string literal
> Process terminated with an exit code of 1
>
> Thanks,
>
> Dick
>
>
> _______
> Tutor maillist - Tutor@python.org
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>
>
--
Regards
Dharmit Shah <http://about.me/dharmit>
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[Tutor] Recursion always returns None
Hello,
I am trying to do the following :
1) Ask user for the length of the word that he'd like to guess (for
hangman game).
2) Pick a random word from /usr/share/dict/words (which I understand
is not the best choice for hangman).
3) Call a function that would pick a random word to proceed further.
Below is the code for the part I described above :
[code]
#!/bin/env python
import random
def pick_random(l, ln): # picks a random word from the list
l of length ln
global mystery
word = random.choice(l)
if word.__len__() != ln:
pick_random(l, ln)# recursion
else:
print "Should return %s" % word # prints the chosen random
word correctly
return word # always
return None, why? :(
if __name__ == "__main__":
ln = raw_input("How long word can you guess (number of alphabets) : ")
ln = int(ln)
l = []
with open("/usr/share/dict/words", "r") as f:
for i in f.readlines():
i = i.split("\n")[0]
if i.isalpha():
l.append(i)
word = pick_random(l, ln)
print word
[/code]
Sample output :
$ python hangman.py
How long word can you guess (number of alphabets) : 6
Should return inarch
None
$
The problem is that the last line "print word" always prints None. I
know I am doing something wrong in the recursion part of the function
"pick_random". Can someone please point what I am missing. Thank you!
Cheers,
Dharmit
--
Dharmit Shah
www.about.me/dharmit
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Re: [Tutor] Recursion always returns None
Hello,
@Hugo Arts : Thank you! That was awesome to read. Thanks for the len()
suggestion.
@ Steve : Thank you. As suggested by Dave Angel, I am going to try the
loop. And even before implementing it, I can feel that it's going to
be more efficient than recursion.
@Dave Angel : Thank you for the loop idea. It didn't strike me at all.
@All : Thanks a bunch for helping me out.
:)
Cheers,
Dharmit
On Tue, Aug 28, 2012 at 7:18 PM, Dave Angel wrote:
> On 08/28/2012 07:23 AM, Dharmit Shah wrote:
>> Hello,
>>
>> I am trying to do the following :
>>
>> 1) Ask user for the length of the word that he'd like to guess (for
>> hangman game).
>> 2) Pick a random word from /usr/share/dict/words (which I understand
>> is not the best choice for hangman).
>> 3) Call a function that would pick a random word to proceed further.
>>
>> Below is the code for the part I described above :
>>
>> [code]
>>
>> #!/bin/env python
>> import random
>>
>> def pick_random(l, ln): # picks a random word from the list
>> l of length ln
>> global mystery
>> word = random.choice(l)
>> if word.__len__() != ln:
>> pick_random(l, ln)# recursion
>> else:
>> print "Should return %s" % word # prints the chosen random
>> word correctly
>> return word # always
>> return None, why? :(
>
> There's no return statement here, to cover the case where the if-clause
> succeeded.
>
>> if __name__ == "__main__":
>> ln = raw_input("How long word can you guess (number of alphabets) : ")
>> ln = int(ln)
>> l = []
>> with open("/usr/share/dict/words", "r") as f:
>> for i in f.readlines():
>> i = i.split("\n")[0]
>> if i.isalpha():
>> l.append(i)
>>
>> word = pick_random(l, ln)
>> print word
>>
>> [/code]
>>
>> Sample output :
>>
>> $ python hangman.py
>> How long word can you guess (number of alphabets) : 6
>> Should return inarch
>> None
>> $
>>
>> The problem is that the last line "print word" always prints None. I
>> know I am doing something wrong in the recursion part of the function
>> "pick_random". Can someone please point what I am missing. Thank you!
>>
>> Cheers,
>> Dharmit
>>
>
> There are two things wrong, one of which has already been pointed out.
> But the most fundamental thing that's wrong is that once you have called
> the recursion, you don't return a value at all, simply falling off the
> end of the function. Python returns a value of None when you omit the
> return statement.
>
> So you should add a statement 'return word', which will eliminate the
> None. But of course it'll be the wrong word. To fix that, you need to
> assign the results of the call to pick_random() to the same local
> variable, word.
>
> As others have pointed out, this is a poor choice for recursion.
> Recursion can be more readable for some problems, when the problem
> statement is naturally recursive. But even then, it can frequently lead
> to stack overruns, and performance problems. But in this case a simple
> loop would make much more sense. So unless the instructor is requiring
> you to use recursion, please redo it as a loop.
>
> While we're at it, please use the len() function, rather than __len__()
> method. And instead doing a split() method for eliminating the
> linefeeds, what you really want to do is rstrip().
>
>
>
> --
>
> DaveA
>
--
Dharmit Shah
www.about.me/dharmit
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Re: [Tutor] List Python Question..Please help
Also, comparison is case sensitive. Meaning, 'A' and 'a' are not the same. Hope that helps. :) On Fri, Sep 27, 2013 at 1:14 PM, Amit Saha wrote: > On Fri, Sep 27, 2013 at 3:48 PM, Jacqueline Canales > wrote: >> So I have been trying to do this program using ifs and or loops. >> I am having a hard time solving this question, If you could please assist me >> in the right direction. >> >> Write a program that lists all the composers on the list ['Antheil', >> 'Saint-Saens', 'Beethoven', 'Easdale', 'Nielsen'] whose name starts and ends >> with the same letter (so Nielsen gets lsited, but Antheil doesn't). >> >> I know below it prints the entire list of composers but i dont know how to >> do the program above. I think I am thinking to much into but ive looked at >> all my notes and online resources and having a hard time coming up with >> anything. >> Please help! >> >> composers = ['Antheil', 'Saint-Saens', 'Beethoven', 'Easdale', 'Nielsen'] >> for person in composers: >> print(person) > > So, here you are printing every compose as you rightly state above. > What you now need to do is: > > For each of the composers (`person'), you need to check if the first > letter and the last letter are the same. Here;s a hint: > >>>> s='abba' > > The first letter: > >>>> s[0] > 'a' > > The last letter: > >>>> s[-1] > 'a' > > > If you now compare these, you will know if they are the same and hence > you print him/her. > > Hope that helps. > -Amit. > > > -- > http://echorand.me > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor -- Dharmit Shah www.about.me/dharmit ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Desktop Notifications on Linux
Hi all,
I am trying to create a script that will go through the
/var/log/secure file on a Linux system and provide desktop
notifications for failed login attempts.
Here is the code - http://pastebin.com/MXP8Yd91
And here's notification.py - http://pastebin.com/BhsSTP6H
I am facing issue in the function "new_attempts_from_last". I am not
able to raise a desktop notification from this function. It always
fails with this traceback - http://pastebin.com/cgHMScv3
I see this error only when I try to raise a notification from the
aforementioned function. If I run test examples under
/usr/share/doc/notify-python/examples, it works just fine. Also, if I
try to raise a notification from under if __name__ == "__main__":, it
works without any issues. So I don't think there's any issue with OS's
notification daemon. Running from python shell like below also works
fine:
In [1]: import notification
In [2]: notification.notification("Hey")
What am I missing or doing wrong here?
If it matters, I am running Fedora 20, python 2.7 and Cinnamon desktop
environment.
For readability purposes, I have provided pastebin links. Let me know
if this is not the correct way.
Regards,
Dharmit.
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Re: [Tutor] Desktop Notifications on Linux
Hi Peter,
On Thu, Apr 10, 2014 at 2:30 PM, Peter Otten <__pete...@web.de> wrote:
> Dharmit Shah wrote:
>
>> I am trying to create a script that will go through the
>> /var/log/secure file on a Linux system and provide desktop
>> notifications for failed login attempts.
>>
>> Here is the code - http://pastebin.com/MXP8Yd91
>> And here's notification.py - http://pastebin.com/BhsSTP6H
>>
>> I am facing issue in the function "new_attempts_from_last". I am not
>> able to raise a desktop notification from this function. It always
>> fails with this traceback - http://pastebin.com/cgHMScv3
>>
>> I see this error only when I try to raise a notification from the
>> aforementioned function. If I run test examples under
>> /usr/share/doc/notify-python/examples, it works just fine. Also, if I
>> try to raise a notification from under if __name__ == "__main__":, it
>> works without any issues. So I don't think there's any issue with OS's
>> notification daemon. Running from python shell like below also works
>> fine:
>>
>> In [1]: import notification
>>
>> In [2]: notification.notification("Hey")
>>
>> What am I missing or doing wrong here?
>>
>> If it matters, I am running Fedora 20, python 2.7 and Cinnamon desktop
>> environment.
>>
>> For readability purposes, I have provided pastebin links. Let me know
>> if this is not the correct way.
>
Thanks for your prompt response.
> Maybe you are running the code as a user that has no "desktop"? Here's a
> strapped-down demo:
>
> $ cat notify_demo.py
> import pynotify
> import sys
>
> pynotify.init("Notification")
> n = pynotify.Notification("Notification", " ".join(sys.argv[1:]))
> n.show()
> $ python notify_demo.py hello world
>
> The notification appeared on my desktop. However, when trying again as root
> I got the error you are seeing:
>
> $ sudo su
> # python notify_demo.py hello again
> Traceback (most recent call last):
> File "notify_demo.py", line 6, in
> n.show()
> glib.GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Notifications was not provided by any .service files
>
That does ring some bells. I am logged into my F20 system as non-root
user but since reading /var/log/secure file requires superuser
privileges, I am running it as sudo:
sudo python secure.py
That probably explains the issue I am facing. I will add the user to
the root group and see if it helps.
Regards,
Dharmit.
>
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