my_sin.py

import math


def my_sin(x):
    e = x
    f = 1.0
    t = 0.0
    for i in range(1, 100):
        if i % 2 == 1:
            t += e / f
        else:
            t -= e / f
        e *= x ** 2.0
        f *= i * 2.0 * (i * 2.0 + 1.0)
    return t


def main():
    # 確認
    print('my_sin :', my_sin(2))
    print('math.sin :', math.sin(2))


if __name__ == '__main__':
    main()