Strings comparison
Karl A. Krueger
kkrueger at example.edu
Mon Dec 30 13:15:42 EST 2002
Dusausoy Bruno <bruno.dusausoy at skynet.be> wrote:
> TypeError: 'in <string>' requires character as left operand
> if o in ("-h"):
^^^^^^
> if o in ("-o"):
^^^^^^
Python thinks these are parenthesized string expressions, and so it is
doing a string "in" operation. I think you want it to think they are
tuples. In order to create a tuple of one item, you need to put a comma
after the item, e.g.: ("-h",)
This is so that Python can also use parentheses for ordinary arithmetic
grouping as well as tuples: ( 2 + 3 ) evaluates to 5, not to a 1-tuple
containing 5.
--
Karl A. Krueger <kkrueger at example.edu>
Woods Hole Oceanographic Institution
Email address is spamtrapped. s/example/whoi/
"Outlook not so good." -- Magic 8-Ball Software Reviews
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