[EMAIL PROTECTED] a écrit :
i am confused.
x=5
y=5
x==y -> True
x is y -> True
shouldnt x is y return False since they shouldnt(dont?) point to the
same place in memory, they just store an equal value?
Python's "variable" do not "store values", they are name to object
bindings. x = 5 is a shortand for globals()['x'] = int(5), which means
"create an int instance with value 5 and bind it to the name 'x' in the
global namespace'. wrt/ the identity test yielding true, it's the result
of a CPython specific optimisation for small integer objects, that are
cached and reused. Since Python integers are immutable, they can safely
be shared. Now since it's an implementation specific thing, you should
by no mean rely on it.
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