File: class2.py

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# class with __init__

class C1:
    def __init__(self):
        self.x = 1

c1 = C1()
print(type(c1) == C1)
print(c1.x)

class C2:
    def __init__(self, x):
        self.x = x

c2 = C2(4)
print(type(c2) == C2)
print(c2.x)

# __init__ should return None
class C3:
    def __init__(self):
        return 10
try:
    C3()
except TypeError:
    print('TypeError')