On Feb 16, 7:05 am, pyt...@bdurham.com wrote: > Thanks for everyone's feedback. I believe my original post's code > (updated following my signature) was in line with this list's feedback. > > Christian: Thanks for reminding me about exponential formats. My updated > code accounts for these type of numbers. I don't need to handle inf or > nan values. My original code's except catches an explicit ValueError > exception per your concern about bare excepts. > > Malcolm > > <code> > # str_to_num.py > > def isnumber( input ): > try: > num = float( input ) > return True > > except ValueError: > return False > > if __name__ == '__main__': > tests = """ > 12 > -12 > -12.34 > .0 > . > 1 2 3 > 1 . 2 > > 1e10 > 1E10 > inf > nan > > 12 and text > just text > """ > > for test in tests.split( '\n' ): > print 'test (%0s), isnumber: %1s' % ( test.strip(), isnumber( > test ) ) > </code>
Do you care about numbers that are representable as an int, but are treated as inf by float()? For example: | >>> s = '1' * 310 | >>> float(s) | inf | >>> a = int(s) | >>> # OK -- http://mail.python.org/mailman/listinfo/python-list
