try / except not worknig correctly

['@'.join([..join(['fred','dixon']),..join(['gmail']

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(my Input)
.. 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

[Robert Kern]

Re: try / except not worknig correctly

'@'.join([..join(['fred','dixon']),..join(['gmail','com'])]) wrote:[color=blue]
> the code below will not execute the except section when i enter a
> number.
> what am i missing ?[/color]

Something that will actually raise ValueError.

It looks like you could use the help of the Python Tutor mailing list.

http://www.python.org/mailman/listinfo/tutor

[color=blue]
> ############### ############### ###########
> .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(my Input)
> . 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[/color]

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

[Brian van den Broek]

Re: try / except not worknig correctly

'@'.join([..join(['fred', 'dixon']), ..join(['gmail', 'com'])]) said
unto the world upon 2005-03-12 19:20:[color=blue]
> 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(my Input)
> . 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
>[/color]

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 (mhammond@skipp inet.com.au)
- see 'Help/About PythonWin' for further copyright information.[color=blue][color=green][color=darkred]
>>> example = raw_input('Give me a number!')[/color][/color][/color]
Give me a number!42[color=blue][color=green][color=darkred]
>>> type(example)[/color][/color][/color]
<type 'str'>[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

I am also not sure why you expected a ValueError:
[color=blue][color=green][color=darkred]
>>> import string
>>> a = 42
>>> string.upper(a)[/color][/color][/color]
Traceback (most recent call last):
File "<interacti ve input>", line 1, in ?
File "C:\PYTHON24\li b\string.py", line 235, in upper
return s.upper()
AttributeError: 'int' object has no attribute 'upper'[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]


Additionally, string methods are often preferred to the string module:[color=blue][color=green][color=darkred]
>>> b = 'lower'
>>> b.upper()[/color][/color][/color]
'LOWER'[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]


You might also want to test

if myInput in ('A', 'B', 'C', 'etc'):
.. break

instead of your chain of if tests.

Best,

Brian vdB

['@'.join([..join(['fred','dixon']),..join(['gmail']

Re: try / except not worknig correctly

1) the tutor list is really slow. but thanks.

2) Thanks Brain, i was missing the string bit. the code i posted (opps)
was not exactly where i was having problems, it just looked like it.

also thanks for the 'in' test, that will come in handy.
i am using chain because i need to do something different for each
twest.

is there a better way to return a tuple for each choice ?

[Pete]

Re: try / except not worknig correctly

'@'.join([..join(['fred','dixon']),..join(['gmail','com'])]) wrote:[color=blue]
> 1) the tutor list is really slow. but thanks.
>
> 2) Thanks Brain, i was missing the string bit. the code i posted (opps)
> was not exactly where i was having problems, it just looked like it.
>
> also thanks for the 'in' test, that will come in handy.
> i am using chain because i need to do something different for each
> twest.
>
> is there a better way to return a tuple for each choice ?
>[/color]
You could try this:[color=blue][color=green][color=darkred]
>>> def doA():[/color][/color][/color]
print 'doing A'
[color=blue][color=green][color=darkred]
>>> def doB():[/color][/color][/color]
print 'doing B'
[color=blue][color=green][color=darkred]
>>> processFuncs = dict()
>>> processFuncs['A'] = doA
>>> processFuncs['B'] = doB
>>> while 1:[/color][/color][/color]
print 'Enter option:'
try:
myInput = raw_input('A or B?')
myInput = myInput.upper()

func = processFuncs[myInput]
func()
except KeyError, e:
print 'Opps wrong option', e
pass


Enter option:
A or B?A
doing A
Enter option:
A or B?B
doing B
Enter option:
A or B?C
Opps wrong option 'C'
Enter option:
A or B?

[Jeremy Bowers]

Re: try / except not worknig correctly

On Sat, 12 Mar 2005 17:06:17 -0800,
'@'.join([..join(['fred','dixon']),..join(['gmail','com'])]) wrote:

I'd also suggest

validInput = "ABCDEFGHIJ KL" # and there are more clever ways to do this,
# but this will do

myInput = raw_input(" ".join(validInp ut) + "?")
if len(myInput) != 1:
# do whatever
pass
if myInput not in validInput:
raise ValueError("Inp ut not in legal input: " + validInput)


Obviously not a drop-in replacement for your code, but ought to clean it
up a little.