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| Date | Mon, 09 Jun 2014 17:06:01 +0100 |
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| Subject | Re: None in string => TypeError? |
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On 2014-06-09 16:34, Roy Smith wrote: > We noticed recently that: > >>>> None in 'foo' > > raises (at least in Python 2.7) > > TypeError: 'in <string>' requires string as left operand, not NoneType > > This is surprising. The description of the 'in' operatator is, 'True if an item of s is equal to x, else False '. From that, I would assume it behaves as if it were written: > > for item in iterable: > if item == x: > return True > else: > return False > > why the extra type check for str.__contains__()? That seems very unpythonic. Duck typing, and all that. > When working with strings, it's not entirely the same. For example: >>> 'oo' in 'foo' True If you iterated over the string, it would return False.
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None in string => TypeError? Roy Smith <roy@panix.com> - 2014-06-09 08:34 -0700
Re: None in string => TypeError? Ryan Hiebert <ryan@ryanhiebert.com> - 2014-06-09 10:42 -0500
Re: None in string => TypeError? Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-09 09:50 -0600
Re: None in string => TypeError? Paul Sokolovsky <pmiscml@gmail.com> - 2014-06-09 18:57 +0300
Re: None in string => TypeError? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-09 16:14 +0000
Re: None in string => TypeError? Chris Angelico <rosuav@gmail.com> - 2014-06-10 02:31 +1000
Re: None in string => TypeError? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-09 16:07 +0000
Re: None in string => TypeError? MRAB <python@mrabarnett.plus.com> - 2014-06-09 17:06 +0100
Re: None in string => TypeError? Shiyao Ma <i@introo.me> - 2014-06-10 00:13 +0800
Re: None in string => TypeError? Roy Smith <roy@panix.com> - 2014-06-09 12:53 -0400
Re: None in string => TypeError? Chris Angelico <rosuav@gmail.com> - 2014-06-10 02:59 +1000
Re: None in string => TypeError? Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-09 11:22 -0600
Re: None in string => TypeError? Chris Angelico <rosuav@gmail.com> - 2014-06-10 03:40 +1000
Re: None in string => TypeError? Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-09 11:58 -0600
Re: None in string => TypeError? Chris Angelico <rosuav@gmail.com> - 2014-06-10 04:02 +1000
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