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Runtime error
Runtime error
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# timer.py
import time
class TimerError(Exception):
"""A custom exception used to report errors in use of Timer class"""
class Timer:
def __init__(self):
self._start_time = None
def start(self):
"""Start a new timer"""
if self._start_time is not None:
raise TimerError(f"Timer is running. Use .stop() to stop it")
self._start_time = time.perf_counter()
def stop(self):
"""Stop the timer, and report the elapsed time"""
if self._start_time is None:
raise TimerError(f"Timer is not running. Use .start() to start it")
elapsed_time = time.perf_counter() - self._start_time
self._start_time = None
print(f"Elapsed time: {elapsed_time:0.4f} seconds") |