Re: Newbie append() question

2006-05-19 Thread Sybren Stuvel 
Brian Blazer enlightened us with:
 def getCurrentClasses():
  classes = []
  print 'Please enter the class name. When finished enter D.'
  while (c != D):

No need for the parentheses, and 'c' doesn't have a value yet. If you
add 'c=' before the while-loop, it should be fine.

  c = raw_input(Enter class name)
  if (c != D):

Here there is also no need for parentheses.

Sybren
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Re: Newbie append() question

2006-05-19 Thread Brian Blazer 
Thanks guys.  Your solutions worked.

I'm still not sure why it was grabbing the prompt string though.

Thanks again,

Brian
[EMAIL PROTECTED]

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Re: Newbie append() question

2006-05-19 Thread Sybren Stuvel 
Brian Blazer enlightened us with:
 I'm still not sure why it was grabbing the prompt string though.

Me neither. Try it in a standalone script instead of an interactive
session.

Sybren
-- 
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself? 
 Frank Zappa
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Newbie append() question

2006-05-18 Thread Brian Blazer 
I promise that this is not homework.  I am trying to self teach here  
and have run into an interesting problem.  I have created a method  
that asks for a class name and then is supposed to add it to classes 
[].  Here is a snippet:

def getCurrentClasses():
 classes = []
 print 'Please enter the class name. When finished enter D.'
 while (c != D):
 c = raw_input(Enter class name)
 if (c != D):
 classes.append(c)

I have been running this in the interactive interpreter and if I  
print the list I get the string Enter class name as the first entry  
in the list and what was supposed to be the first entry as the second  
element like this:

Enter class name: cs1
['Enter class name: cs1']

I guess that I assumed that c would be equal to the value entered by  
the user not the prompt string.  It actually looks like it is taking  
the whole thing as one string.  But then if I enter more classes I  
get this:

Enter class name: cs2
['Enter class name: cs1', 'cs2']

So with the second and successive inputs, it appends the entered string.

Hopefully someone could enlighten me as to what is going on and maybe  
offer a suggestion to help me figure this one out.

Thank you for your time,

Brian
[EMAIL PROTECTED]




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Re: Newbie append() question

2006-05-18 Thread Gerard Flanagan 
Brian Blazer wrote:
 I promise that this is not homework.  I am trying to self teach here
 and have run into an interesting problem.  I have created a method
 that asks for a class name and then is supposed to add it to classes
 [].  Here is a snippet:

 def getCurrentClasses():
  classes = []
  print 'Please enter the class name. When finished enter D.'
  while (c != D):
  c = raw_input(Enter class name)
  if (c != D):
  classes.append(c)

 I have been running this in the interactive interpreter and if I
 print the list I get the string Enter class name as the first entry
 in the list and what was supposed to be the first entry as the second
 element like this:

 Enter class name: cs1
 ['Enter class name: cs1']

 I guess that I assumed that c would be equal to the value entered by
 the user not the prompt string.  It actually looks like it is taking
 the whole thing as one string.  But then if I enter more classes I
 get this:

 Enter class name: cs2
 ['Enter class name: cs1', 'cs2']

 So with the second and successive inputs, it appends the entered string.

 Hopefully someone could enlighten me as to what is going on and maybe
 offer a suggestion to help me figure this one out.

 Thank you for your time,

 Brian
 [EMAIL PROTECTED]

your code gives me:

UnboundLocalError: local variable 'c' referenced before assignment

Is this the exact code you ran?

This should work:

def getCurrentClasses():
classes = []
print 'Please enter the class name. When finished enter D.'
c = None
while (c != D):
c = raw_input(Enter class name)
if (c != D):
classes.append(c)
print classes

but you are checking the same condition twice: c!= 'D', which is
unnecessary.Try:

def getCurrentClasses2():
classes = []
print 'Please enter the class name. When finished enter D.'
while True:
c = raw_input(Enter class name: )
if (c != D):
classes.append(c)
else:
break
print classes

getCurrentClasses2()

Gerard

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