Measure function run time with "with" statement

timing_function.py

#!/usr/bin/env python3
import time


class Timer:
    """
    A hack to measure function runtime with some hacking
    https://preshing.com/20110924/timing-your-code-using-pythons-with-statement/
    """
    def __enter__(self):
        self.start = time.perf_counter() # this function used to be time.clock()
        return self

    def __exit__(self, *args):
        self.end = time.perf_counter()
        self.interval = self.end - self.start


def quartic_power():
    res = 0
    for i in range(0, 100):
        for j in range(0, 100):
            for k in range(0, 100):
                for x in range(0, 100):
                    res += i * j * k * x


with Timer() as t:
    quartic_power()
print(t.interval)