'in' operator
Joshua Marshall
jmarshal at mathworks.com
Tue Feb 20 09:47:12 EST 2001
Terry Reedy <tjreedy at udel.edu> wrote:
> "Walter Moreira" <walterm at cmat.edu.uy> wrote in message
> news:mailman.982374799.24358.python-list at python.org...
>> Why the following test raise an error?
>>
>> >>> '' in 'yY'
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in ?
>> TypeError: 'in <string>' requires character as left operand
> Precisely for the reason stated. A character is a string of length 1. A
> null string (of length 0) is not a character. Neither are strings of
> length >= 2 [for which one must use find() or match()].
Wouldn't it be more natural for this to be a ValueError? There is no
character type in Python -- '', 'y', and 'yY' are all strings.
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