Re: try / except not worknig correctly

[Brian van den Broek]

'@'.join([..join(['fred', 'dixon']), ..join(['gmail', 'com'])]) said
unto the world upon 2005-03-12 19:20:
the code below will not execute the except section when i enter a
number.
what am i missing ?
#########################################
.while 1:
.   print 'Pump Protection ? '
.   #line 133
.    try:
.        myInput = raw_input('A B C D E F G H I J K L ? ')
.        myInput = string.upper(myInput)
.        if myInput == 'A':break     #
.        if myInput == 'B':break     #
.        if myInput == 'C':break     #
.        if myInput == 'D':break     #
.        if myInput == 'E':break     #
.        if myInput == 'F':break     #
.        if myInput == 'G':break     #
.        if myInput == 'H':break     #
.        if myInput == 'I':break     #
.        if myInput == 'J':break     #
.        if myInput == 'K':break     #
.        if myInput == 'L':break     #
.    except ValueError:
.         print "Oops! That was no valid number.  Try again..."
.         pass
.'s are to preserve indents.
fred
Hi fred,
You are missing that raw_input returns a string.
PythonWin 2.4 (#60, Nov 30 2004, 11:49:19) [MSC v.1310 32 bit (Intel)] 
on win32.
Portions Copyright 1994-2004 Mark Hammond ([EMAIL PROTECTED]) 
- see 'Help/About PythonWin' for further copyright information.
example = raw_input('Give me a number!')
Give me a number!42
type(example)
<type 'str'>

I am also not sure why you expected a ValueError:
>>> import string
>>> a = 42
>>> string.upper(a)
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
  File "C:\PYTHON24\lib\string.py", line 235, in upper
    return s.upper()
AttributeError: 'int' object has no attribute 'upper'
>>>
Additionally, string methods are often preferred to the string module:
>>> b = 'lower'
>>> b.upper()
'LOWER'
>>>
You might also want to test
if myInput in ('A', 'B', 'C', 'etc'):
.    break
instead of your chain of if tests.
Best,
Brian vdB
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