applying a filter on a string in python -

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i have user typing in username , want valid strings pass through, meaning characters in [a-za-z0-9]. pretty new python , unsure of syntax.

here's example of want in code, check through username , return false upon illegal character.:

def _checkinput(input):      char in input:           if !(char in [a-za-z0-9]):                return false      return true

thanks!

you need isalnum:

>>> name = raw_input('enter name: ') enter name: foo_bar >>> name.isalnum() false >>> name = raw_input('enter name: ') enter name: foobar >>> name.isalnum() true

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