Simple class useful for timing Python code.

timer.py

class Timer:
    """Measure time used.

    # Setup timer
    >>> timer = Timer()

    # Access as a string
    >>> timer.print()
    Time elapsed is 0:00:03.
    >>> timer.print()
    Time elapsed is 0:00:04.

    # Access as a float
    >>> timer()
    6.841332235
    >>> timer()
    7.970274425
    """
    # Ref: https://stackoverflow.com/a/57931660/

    def __init__(self, round_ndigits: int = 0):
        self._round_ndigits = round_ndigits
        self._start_time = timeit.default_timer()

    def __call__(self) -> float:
        return timeit.default_timer() - self._start_time

    def __str__(self) -> str:
        return str(datetime.timedelta(seconds=round(self(), self._round_ndigits)))

    def print(self):
        print(f'Time elapsed is {self}.')