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elapsed_time.py
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elapsed_time.py
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#!/usr/bin/env python3
from contextlib import contextmanager
from datetime import datetime
from time import perf_counter
@contextmanager
def timer(name="timer"):
start = datetime.now()
yield
print(f"Elapsed time ({name}): {datetime.now() - start}")
@contextmanager
def elapsed_time(name="elapsed_time"):
"""Two ways to use elapsed_time():
1. As a decorator to time the execution of an entire function:
@elapsed_time("my_slow_function")
def my_slow_function(n=10_000_000):
pass
2. As a context manager to time the execution of a block of code inside a function:
with elapsed_time("my_slow_block_of_code"):
pass
.
"""
start = perf_counter()
yield
print(f"Elapsed time ({name}): {perf_counter() - start:0.8} seconds")
if __name__ == "__main__":
# measure the speed of two ways to create a dict
with timer("dict = {}"):
for _ in range(10_000_000):
d: {} # type: ignore
with timer("dict = dict()"): # takes ~50% longer than {}
for _ in range(10_000_000):
d = {}