simple timer function decorator

timer.py

import time

def timer(f):
    """
    timer function decorator. Prints time elapsed (in seconds) of the function's
    runttime.
    
    Usage:

        @timer
        def my_function():
            ...
    """
    def _f():
        begin = time.perf_counter()
        f()
        end = time.perf_counter()
        print(f"Time elapsed: {end - begin}")
    return _f