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Why can’t Python handle true/false values as I expect?
Seems a stupid question, but why is the following statement in Python not explicitly forbidden?
>> True=False
>> True
False
How is True and False handled by Python interpreter?
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2 is True is false (as is 1 is True ). Sure, bool() will return True for non-zero integer inputs, but that doesn't mean the values "are" True .
The Python Boolean type is one of Python's built-in data types. It's used to represent the truth value of an expression. For example, the expression 1 <= 2 is True , while the expression 0 == 1 is False . Understanding how Python Boolean values behave is important to programming well in Python.
Python interprets multiple (in)equalities the way you would expect in Math: In Math a = b = c mean all a = b , b = c and a = c . So True is False == False means True == False and False == False and True == False , which is False .
Hence, % in %hist does not exist in all python interpreters. Thus the statement is false.
True, just like str or any other builtin, is just a name that exists in the scope by default. You can rebind it like any other such name.
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Python actually has very few reserved words. All the rest are subject to redefinition. It's up to you to be careful!
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