Pierre Quentel wrote: > 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 > > By the way, I searched in the documentation what "obj in list" meant and > couldn't find a precise definition (does it test for equality or > identity with one of the values in list ? equality, it seems) ; did I > miss something ?
>>> issubclass(bool, int) True >>> isinstance(False, int) True >>> False == 0 True >>> int(False) 0 but seriously, unless you're writing an introspection tool, testing for bool is pretty silly. just use "if v" or "if not v", and leave the rest to Python. </F> -- http://mail.python.org/mailman/listinfo/python-list
