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def logged(f):
def wrapper(a, b):
print('Calling function', f)
return f(a, b + 1)
return wrapper
@logged
def add(a, b):
return a + b
c = add(10, 3)
assert c == 14
@logged
def add3(a, b, c=2):
return a + b + c
d = add3(12, 5)
assert d == 20
def f(func): return lambda: 42
class A: pass
a = A()
a.a = A()
a.a.x = f
@a.a.x
def func():
pass
assert func() == 42