Timer.py

# timer.py

import time


class Timer:
    timers = {}

    def __init__(
        self,
        name=None,
        text="Elapsed time: {:0.4f} seconds",
        logger=print,
    ):
        self._start_time = None
        self.name = name
        self.text = text
        self.logger = logger

        # Add new named timers to dictionary of timers
        if name:
            self.timers.setdefault(name, 0)

    # Other methods are unchanged

    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

        if self.logger:
            self.logger(self.text.format(elapsed_time))
        if self.name:
            self.timers[self.name] += elapsed_time

        return elapsed_time