If the input has more than one ',', e.g. '1,2,3'. You may like to use 'split'
function, and avoid find.
On 24-Jan-2010, at 9:43 PM, Robert Berman wrote:
> Good morning,
>
> Given the following code snippets:
>
> def getuserinput():
> while True:
> s1 = raw_input('Enter fraction as N,D or 0,0 to exit>>')
> delim = s1.find(',')
> if delim < 0:
> print 'invalid user input'
> else:
> n = int(s1[0:delim])
> d = int(s1[delim+1::])
> return n,d
>
> def main():
> while True:
> n,d = getuserinput()
> if n == 0 or d == 0: return 0
>
> n and d are always returned provided the input is given as n,d. n/d will
> print an error message and the loop will reiterate until the user format is
> correct. Please note there is no true ending return for getuserinput() as it
> is hung off an if statement and if by some chance it breaks, it should
> return None which will abort the program. While I suspect this style is
> devious, is it dangerous or ‘wrong’ to use. Comments and other renditions are
> most welcome.
>
> Thank you,
>
> Robert Berman
>
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