grbgooglefan wrote: > I am creating functions, the return result of which I am using to make > decisions in combined expressions. > In some expressions, I would like to inverse the return result of > function. > > E.g. function contains(source,search) will return true if "search" > string is found in source string. > I want to make reverse of this by putting it as: > if ( ! contains(s1,s2) ): > return 1 > > I found that "!" is not accepted by Python & compile fails with > "invalid syntax". > Corresponding to this Boolean Operator we've "not" in Python. > > How can I make "not" as "!"?
"not" is a perfectly valid boolean operator in Python and means just what "!" means in C. The equivalent binary operator is "~", just like in C. >>> print not True False >>> print not 1 False >>> print not 0 True >>> print ~1 -2 >>> print ~0 -1
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