2018-07-28

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import math

def my_abs(x):

    if not isinstance(x, (int, float)):

        raise TypeError('bad operand type')

    if x >= 0:

        return x

    else:

        return -x

def move(x, y, step, angle=0):

    nx = x + step * math.cos(angle)

    ny = y - step * math.sin(angle)

    return nx, ny

n = my_abs(-20)

print(n)

x, y = move(100, 100, 60, math.pi / 6)

print(x, y)

# TypeError: bad operand type:

my_abs('123')