| import time | |
| class Stopwatch: | |
| def __init__(self): | |
| self.start_time = None | |
| self.end_time = None | |
| def start(self): | |
| self.start_time = time.time() | |
| def stop(self): | |
| self.end_time = time.time() | |
| def elapsed_time(self): | |
| if self.start_time and self.end_time: | |
| return self.end_time - self.start_time | |
| return None | |