micropython/tests/basics/decorator.py

# test decorators

def dec(f):
    print('dec')
    return f

def dec_arg(x):
    print(x)
    return lambda f:f

# plain decorator
@dec
def f():
    pass

# decorator with arg
@dec_arg('dec_arg')
def g():
    pass

# decorator of class
@dec
class A:
    pass