Re: [Tutor] Python 2.7 on Ubuntu 11.10 - Do not unintall
On Wed, Nov 2, 2011 at 11:39 AM, Prasad, Ramit wrote: > >I use OS X / Windows and I have not noticed any dependency issues. So I > was not aware about the same with respect to Ubuntu. I am glad that I > learnt something from this discussion. > > I might be wrong, but Ubuntu itself is not dependent on Python. You can > probably run a minimalist headless Ubuntu server without Python. Especially > since the OP seemed able to login to his machine without it. X/Desktop > requires it. > > Ubuntu is not dependent on Python, but the environments (Unity, GNOME, etc) will brake if you don't have Python. > I am not sure if OS X needs it, but I do know it comes with Python > installed. > > Joel M: Pretty much the only things that require restarting (from my > experience with Debian) are kernel changes and hardware changes. You just > had to restart X / login manager (gdm). > > Yea I know, but I restarted anyhow. > Ramit > > > Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology > 712 Main Street | Houston, TX 77002 > work phone: 713 - 216 - 5423 > > -- > > This email is confidential and subject to important disclaimers and > conditions including on offers for the purchase or sale of > securities, accuracy and completeness of information, viruses, > confidentiality, legal privilege, and legal entity disclaimers, > available at http://www.jpmorgan.com/pages/disclosures/email. > ___ > 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
Re: [Tutor] login window using Tk
I am also intrested in this topic. Chris were you thinking of using the window.hide() method? -Joel M On Nov 1, 2011 1:21 PM, "Chris Hare" wrote: > > I am working on a python Tk program which involves a login window and I am > looking for some advice. > > Currently the code I have creates a window (Toplevel) where the login > controls are and I am running that using a main loop for the window. The > root window is hidden. The objective is that when the user ha successfully > authenticated, the login window is closed or the main loop os exited and > then the root window is shown and the main loop started for the actual > application. > > Questions: > 1. Is this the best way of doing this or is there a better way? > 2. How do I exit the main loop when the user has authenticated? > > Thanks > > Chris Hare > ch...@labr.net > http://www.labr.net > > > > Chris Hare > ch...@labr.net > http://www.labr.net > > > ___ > 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
Re: [Tutor] Paper Rock Scissors game - User's choice not returned properly
On Mon, Oct 31, 2011 at 1:09 PM, Joel Montes de Oca
wrote:
> On Mon 31 Oct 2011 12:14:40 PM EDT, Hugo Arts wrote:
>
>
> On Mon, Oct 31, 2011 at 4:41 PM, Joel Montes de Oca
> wrote:
>
>
> Hello everyone,
>
> I am having a little trouble with a block of code that isn't behaving the
> way I would expect. Maybe you can give me a hand and point where it is
> going
> wrong.
>
> The function that is not working correctly belongs to a Paper Rock Scissor
> game I am making.
>
> This particular function is responsible to:
> a) Get the user's choice (Paper, Rock, or Scissors)
> b) Return the user's choice within the variable choice to the function
> that called it.
>
> The function works correctly as long as the user does not try to enter a
> string other than 'P', 'R', or 'S'.
>
> Logic:
> Take the user's string and put it in the variable choice.
> If choice is not 'P', 'R', or 'S' then pass a message to the user and
> call the function again.
> If the choice is 'P', 'R', or 'S' then return choice to where it was
> called from.
>
> The problem is this.
>
> When the user enters a string other than the valid ones, the if statements
> catches it and calls the same function again so the user can enter a valid
> string. But the variable choice does not get assigned the new string
> entered
> by the user, instead it is empty.
>
> I would expect if the function runs again, the variable choice would be
> updated to the last value given by the user.
>
> The function: ( http://dpaste.com/644857/)
>
> def UserChoice (): # The function that returns the choice from the user
> print 'Please select (P) for paper, (R) for Rock, or (S) for Scissors.'
> choice = raw_input('What is your selection?: ')
>
> if choice.lower() not in ('p', 'r','s'): # Converts the user's choice to
> lowercase and confirms the choice is valid
> print 'I am sorry, you entered \'' + choice.upper() + '\' which is an
> invalid response. Please try again.'
> raw_input('Press Enter to try again.')
> UserChoice () # If the choice is not valid, run the function over
> else:
> return choice
>
>
>
> Your problem is that you don't quite understand recursion.
>
> When a function calls itself, it's not actually any different from
> when a function A calls another function B. Once function B is done
> running and returns, control goes back to function A. It doesn't
> matter if function B is actually the same function as A. In fact, even
> if A and B are the same function, they don't "share" any variables and
> are totally separate as if they were two different functions that just
> happened to do the same thing.
>
> So, how does this apply to your function? Let's go through a run of
> it. We call UserChoice (this is function A) and we input a wrong
> letter. So, A calls UserChoice again (this is function B), and this
> time we input something valid. So, function B runs the line "return
> choice."
>
> Control now returns to function A, right at the point where we called
> function B. So what do we do here with the choice that was just
> returned from function B? Well, looking at the line where it's called,
> it's just "UserChoice()". So we do nothing. We just throw it away.
> Then, we continue on with function A, move out of the if statement,
> and "fall off the end" of the function. And when that happens, Python
> returns None from function A to show you that nothing was returned.
>
> If you understood all that, you should be able to fix your problem.
>
> Hugo
>
>
> Hey Hugo,
>
> I think I understand your explanation. Let me see if I get it.
>
> The code:
>
> def UserChoice (): *# I WILL CALL THIS FUNCTION A*
>
>
> print 'Please select (P) for paper, (R) for Rock, or (S) for Scissors.'
> choice = raw_input('What is your selection?: ')
>
> if choice.lower() not in ('p', 'r','s'):
>
> print 'I am sorry, you entered \'' + choice.upper() + '\' which is an
> invalid response. Please try again.'
> raw_input('Press Enter to try again.')
>
> UserChoice () *# I WILL CALL THIS FUNCTION B*
> else:
> return choice *# I WILL CALL THE ORIGINAL CALLING FUNCTION, FUNCTION
> MAIN*
>
>
> OK so when the user uses a valid letter, the variable choice gets
> returned to FUNCTION MAIN. Everything works fine.
>
> When the user e
Re: [Tutor] Method to create small and simple database
On Sat, Oct 29, 2011 at 6:58 PM, Alan Gauld wrote: > On 29/10/11 19:28, Joel Montes de Oca wrote: > > After looking at the Python module documentation for sqlite3 >> (http://docs.python.org/**library/sqlite3.html#module-**sqlite3<http://docs.python.org/library/sqlite3.html#module-sqlite3>), >> it seems >> to me it's the best way to make the small database that I am looking for. >> > > SQLlite is a great way to build small scale SQL databases. > However for this app I'd probably second the advice to use shelve. > Shelve acts like a dictionary in a file so you can associate a list of > items with a user very very easily. > > > > Now I need to look for a basic tutorial on constructing a simple >> database (tables, rows, keys) and how to connect all that stuff >> together. If anyone happens to know of a good intro tutorial or >> documentation to database concepts, please forward it to me. >> > > You can try the database topic in my tutorial(see below). > It's only available for Python v2 at present but the translation > to Python v3 (if that's what you are using) is trivial. > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > > > __**_ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/**mailman/listinfo/tutor<http://mail.python.org/mailman/listinfo/tutor> > I will take a look into Shelve and Alan's tutorial sometime this coming week. Keep the suggestions coming if there's more. :) -Joel M. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
