Decorators in Python

Decorators in Python is basically metaprogramming. To understand decorators in Python, some things will be clear:

• function are high-order objects
• you can pass funcions as arguments
• you can declare inner functions

Now, it’s very simple create one decorator:

import time


def time_execution(function):
    def wrapper():
        start_time = time.time()
        function()
        end_time = time.time()
        print("[{function}] Time Execution: {total_time}".format(
            function=function.__name__,
            total_time=str(end_time - start_time))
        )

    return wrapper

@time_execution
def main():
    for n in range(0, 10000000):
        pass

main()

First thing, we import the module time. Second, we use the sugar sintax “@”. This indicate to the Python that is a decorator. The core is the function “time_execution”. Her receive on function and involves the real function, called of “wrapper”. So, you first decorator works fine.

and that’s all folks!

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