#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""Measure Python (CPython, 2 or 3) function-call overhead.

It gives a measure consistently about 200–230 ns on my laptop in
Python 3 and more like 190 ns in Python 2.

"""
from time import time

def bar():
    pass

def foo():
    bar()

n = int(1e7)

if __name__ == '__main__':
    start = time()
    for i in range(n):
        bar()
    onefunc = time() - start

    start = time()
    for i in range(n):
        foo()
    twofunc = time() - start
    print((twofunc-onefunc)/n, "seconds per niladic function call and return")