How to modify meaning of builtin function "not" to "!"?

[Ivan Voras]

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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