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 "!"?
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