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#!/usr/bin/env python3
import time
from typing import Callable
class Timer(object):
"""
with timer.Timer() as t:
do_the_thing()
walltime = t()
print(f'That took {walltime}s.')
"""
def __init__(self) -> None:
self.start = None
self.end = None
pass
def __enter__(self) -> Callable[[], float]:
self.start = time.perf_counter()
self.end = 0.0
return lambda: self.end - self.start
def __exit__(self, *args) -> bool:
self.end = time.perf_counter()
return True
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