Python class decorator implements timer @timer

Class decorator

Timer

To count the running time of each function, you can design a class decorator as a timer, and then declare it directly in front of the function each time it is used.
The following are general timers. Just declare @timer in front of the function when using it.

# This is for timing
def timer(func):
    def func_wrapper(*args,**kwargs):
        from time import time
        time_start = time()
        result = func(*args,**kwargs)
        time_end = time()
        time_spend = time_end - time_start
        print('\n{0} cost time {1} s\n'.format(func.__name__, time_spend))
        return result
    return func_wrapper

Write @timer directly above the function definition when using it

@timer
def test():
	print("hello world!")