circuitpython/tests/basics/builtin_hash.py

# test builtin hash function

print(hash(False))
print(hash(True))
print({():1}) # hash tuple
print({(1,):1}) # hash non-empty tuple
print(hash in {hash:1}) # hash function
print(type(hash(list.pop))) # hash checked function (mp_type_checked_fun)
print(type(hash([].pop))) # hash bound method
print(type(hash(object()))) # hash object instance
print(type(hash(super(object, object)))) # hash super
print(type(hash(classmethod(hash)))) # hash classmethod
print(type(hash(staticmethod(hash)))) # hash staticmethod
print(type(hash(iter("")))) # hash string iterator
print(type(hash(iter(b"")))) # hash bytes iterator
print(type(hash(iter(range(0))))) # hash range iterator
print(type(hash(map(None, [])))) # hash map object
print(type(hash(zip([])))) # hash zip object

def f(x):
    def g():
        return x
    return g

print(type(hash(f(1)))) # hash closure

try:
    hash([])
except TypeError:
    print("TypeError")

class A:
    def __hash__(self):
        return 123
    def __repr__(self):
        return "a instance"

print(hash(A()))
print({A():1})

# all user-classes have default __hash__
class B:
    pass
hash(B())

# if __eq__ is defined then default __hash__ is not used
class C:
    def __eq__(self, another):
        return True
try:
    hash(C())
except TypeError:
    print("TypeError")

# __hash__ must return an int
class D:
    def __hash__(self):
        return None
try:
    hash(D())
except TypeError:
    print("TypeError")

# __hash__ returning a bool should be converted to an int
class E:
    def __hash__(self):
        return True
print(hash(E()))