This is pertaining to python 2.x
In the following class, if we subclass "object", I understand the methods are inherited in the derived class Foo which includes __hash__ (can see this by printing dir(Foo() )
Hence calling hash(Foo()) calls the magic method __hash__ and gives us a hash value.
However, if we don't subclass "object", resulting in dir(Foo()) not listing out the __hash__ method, so then why do we still get a hash value in python2?
I believe in python3 this problem has been addressed since the methods from the "object*" class are inherited by default.
#class Foo(object) Works since __hash__ is available in the base class
class Foo: #Why does this work?
def __init__(self):
self.x = None
a = Foo()
print dir(a) # No __hash__ magic method
print hash(a)
# Expecting an error like non-hashable or __hash__ not implemented
# or something similar