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#!/usr/bin/env python3
"""A simple stopwatch decorator / context for timing things."""
import contextlib
import time
from typing import Callable, Literal
class Timer(contextlib.AbstractContextManager):
"""
A stopwatch to time how long something takes (walltime).
e.g.
with stopwatch.Timer() as t:
do_the_thing()
walltime = t()
print(f'That took {walltime} seconds.')
"""
def __init__(self) -> None:
self.start = 0.0
self.end = 0.0
def __enter__(self) -> Callable[[], float]:
"""Returns a functor that, when called, returns the walltime of the
operation in seconds.
"""
self.start = time.perf_counter()
self.end = 0.0
return lambda: self.end - self.start
def __exit__(self, *args) -> Literal[False]:
self.end = time.perf_counter()
return False
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