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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

class Point:

"""Represents a point in 2-D space.

attributes: x, y

"""

def __init__(self, x=0, y=0):

self.x = x

self.y = y

def __str__(self):

return '(%g, %g)' % (self.x, self.y)

def __add__(self, other):

"""Adds a Point or tuple."""

if isinstance(other, Point):

return self.add_point(other)

elif isinstance(other, tuple):

return self.add_tuple(other)

else:

msg = "Point doesn't know how to add type " + type(other)

raise TypeError(msg)

def add_point(self, other):

"""Adds a point."""

return Point(self.x + other.x, self.y + other.y)

def add_tuple(self, other):

"""Adds a tuple."""

return Point(self.x + other[0], self.y + other[1])

def main():

p1 = Point(1, 2)

p2 = Point(3, 4)

print(p1)

print(p2)

print(p1 + p2)

print(p1 + (3, 4))

if __name__ == '__main__':

main()