[Tutor] Local vs global

[Dave Angel]

bibi midi wrote:
> On Sun, Nov 8, 2009 at 6:20 AM, bibi midi <bibsmendez at gmail.com> wrote:
>
>
>   
>> Thank you all for the helpful insights. I will keep in mind the naming
>> rules in Python, so as not to have it in collision with Python's
>> builtins.
>>
>> The mention to tidy up e.g. "compartmentalize" code is also noted. I
>> agree definitely.
>>
>> I'm reworking my code and will post back.
>>
>>     
>
> For reason unknown to me the script dont repeat itself
> when asked if to play again or not no matter what juggling of the
> while/if conditionals i do, the result is the same. What am i
> missing?
>
> Also, I'm not sure I'm right in the assignment ans = choose_Cave.
> I code it like so because the assignment ans = choose_Cave()
> the prompt 'Choose a cave' is repeated when the script is run.
> Dont want this. I tested this when run in ipython.
>
> I dont know if there is a way to just retrieve the return value to a
> variable AND not run the whole function i mean in the case of
> ans = choose_Cave(). Would love to hear your expert insights by return.
>
> http://paste.debian.net/51004/
>
>
>   
You have the following line at top-level:

    if ask.lower not in reply:

But you're not calling the method str.lower(), you're just creating a 
function object from it.  You need those parentheses.

    if ask.lower() not in reply:


You have the following fragment in main():

    print(intro)
    choose_Cave()
    ans = choose_Cave    # use: pass function by reference
    checkCave(ans)


which has two references to choose_Cave().  The first one calls it, but 
throws away the return value.  The second does not call it at all, but 
merely creates a function object and stores it in ans.  You need to 
combine your two intents in one line:

    print(intro)
    ans = choose_Cave()    # use: pass function by reference
    checkCave(ans)

Hope that helps.  Remember, that unlike Pascal, in Python you don't call 
the function unless you include the parentheses.

DaveA