debug methods like you would do it using Aspect Oriented Programming (AOP)

debugging_using_aspect_oriented_programming_aop.py

# python 3
def enter_exit_info(func):
    def wrapper(*arg, **kw):
        print(f'-- entering {func.__name__}')
        res = func(*arg, **kw)
        print(f'-- exiting {func.__name__}')
        return res
    return wrapper


@enter_exit_info
def f(x):
    print(f'In: {x}')
    res = x + 2
    print(f'Out: {res}')
    return res


a = f(2)
# Outputs:
#     -- entering f
#     In: 2
#     Out: 4
#     -- exiting f