class MyClass1:
def f1(self):
print("1")
class MyClass2:
def f2(self):
print("2")
class MyClass3:
def f3(self):
print("3")
class MyClass4:
def f4(self):
print("4")
x: MyClass1 = MyClass1()
x.f1()
x: MyClass2 = MyClass2()
x.f2()
class MyClass:
x: MyClass3 = MyClass3()
def g():
x.f3()
def f(x: MyClass4):
x.f4()