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# Case 1: Immutable object (e.g. number-like)
# __iadd__ should not be defined, will be emulated using __add__
class A:
def __init__(self, v):
self.v = v
def __add__(self, o):
return A(self.v + o.v)
def __repr__(self):
return "A({})".format(self.v)
a = A(5)
b = a
a += A(3)
print(a)
# Should be original a's value, i.e. A(5)
print(b)
# Case 2: Mutable object (e.g. list-like)
# __iadd__ should be defined
class L:
def __init__(self, v):
self.v = v
def __add__(self, o):
# Should not be caled in this test
print("L.__add__")
return L(self.v + o.v)
def __iadd__(self, o):
self.v += o.v
return self
def __repr__(self):
return "L({})".format(self.v)
c = L([1, 2])
d = c
c += L([3, 4])
print(c)
# Should be updated c's value, i.e. L([1, 2, 3, 4])
print(d)
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