计算运行时间

elapsed_time.py

import time

class ET:
  def __init__(self):
    self.start_time = time.time()
    
  def __call__(self):
    return time.time() - self.start_time
  
  
et = ET()
.....
print(f'elapsed time: {et():.2f}')


# from https://github.com/writeson/async_python_programming_presentation/blob/master/code/example_3.py