Pierre Quentel wrote: > Hi all, > > In some program I was testing if a variable was a boolean, with this > test : if v in [True,False] > > My script didn't work in some cases and I eventually found that for v = > 0 the test returned True > > So I changed my test for the obvious "if type(v) is bool", but I still > find it confusing that "0 in [True,False]" returns True
>From the docs: Python Library Reference, section 2.3.10.9: "Boolean values are the two constant objects False and True. They are used to represent truth values (although other values can also be considered false or true). In numeric contexts (for example when used as the argument to an arithmetic operator), they behave like the integers 0 and 1, respectively." I don't blame you for not knowing about this; it is rather unintuitive. -- David -- http://mail.python.org/mailman/listinfo/python-list
