Python decorators

decorators.py

import functools
import time

def readable_time(t):
    a = ''
    if t < 1:
        a = f'{t:.2f} sec'
    elif t < 60:
        a = f'{t:.0f} sec'
    elif t < 3600:
        a = f'{t//60:.0f} min, {t%60:.0f} sec'
    else:
        a = f'{t//3600:.0f} hour, {(t-3600*(t//3600))//60:.0f} min, {t%60:.0f} sec'
    return a

def timer(func):
    """Print the runtime of the decorated function"""
    @functools.wraps(func)
    def wrapper_timer(*args, **kwargs):
        start_time = time.perf_counter()
        value = func(*args, **kwargs)
        end_time = time.perf_counter()
        run_time = end_time - start_time
        print(f"Finished {func.__name__!r} in {readable_time(run_time)}")
        return value
    return wrapper_timer