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# Test that returning of NotImplemented from binary op methods leads to
# TypeError.
try:
NotImplemented
except NameError:
print("SKIP")
raise SystemExit
class C:
def __init__(self, value):
self.value = value
def __str__(self):
return "C({})".format(self.value)
def __add__(self, rhs):
print(self, '+', rhs)
return NotImplemented
def __sub__(self, rhs):
print(self, '-', rhs)
return NotImplemented
def __lt__(self, rhs):
print(self, '<', rhs)
return NotImplemented
def __neg__(self):
print('-', self)
return NotImplemented
c = C(0)
try:
c + 1
except TypeError:
print("TypeError")
try:
c - 2
except TypeError:
print("TypeError")
try:
c < 1
except TypeError:
print("TypeError")
# NotImplemented isn't handled specially in unary methods
print(-c)
# Test that NotImplemented can be hashed
print(type(hash(NotImplemented)))
|
