python function overloading

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Chiara
24 Nov 2017
1class A():
2  def __init__(self, name):
3    self.name = name
4  
5  # This func will define what happens when adding two obects type A
6  def __add__(self, b):
7    return (str(self.name) + " " + str(b.name))
8  
9  # This func will define what happens when converting object to str
10  def __str__(self):	# Requested with the print() func
11    return self.name
12
13Var1 = A('Gabriel')
14Var2 = A('Stone')
15
16Var3 = Var1 + Var2
17
18print(Var1)
19print(Var2)
20print(Var3)
Vincent
26 Feb 2018
1>>> from multipledispatch import dispatch
2>>> from collections import namedtuple
3>>> from types import *  # we can test for lambda type, e.g.:
4>>> type(lambda a: 1) == LambdaType
5True
6
7>>> Sprite = namedtuple('Sprite', ['name'])
8>>> Point = namedtuple('Point', ['x', 'y'])
9>>> Curve = namedtuple('Curve', ['x', 'y', 'z'])
10>>> Vector = namedtuple('Vector', ['x','y','z'])
11
12>>> @dispatch(Sprite, Point, Vector, int)
13... def add_bullet(sprite, start, direction, speed):
14...     print("Called Version 1")
15...
16>>> @dispatch(Sprite, Point, Point, int, float)
17... def add_bullet(sprite, start, headto, speed, acceleration):
18...     print("Called version 2")
19...
20>>> @dispatch(Sprite, LambdaType)
21... def add_bullet(sprite, script):
22...     print("Called version 3")
23...
24>>> @dispatch(Sprite, Curve, int)
25... def add_bullet(sprite, curve, speed):
26...     print("Called version 4")
27...
28
29>>> sprite = Sprite('Turtle')
30>>> start = Point(1,2)
31>>> direction = Vector(1,1,1)
32>>> speed = 100 #km/h
33>>> acceleration = 5.0 #m/s**2
34>>> script = lambda sprite: sprite.x * 2
35>>> curve = Curve(3, 1, 4)
36>>> headto = Point(100, 100) # somewhere far away
37
38>>> add_bullet(sprite, start, direction, speed)
39Called Version 1
40
41>>> add_bullet(sprite, start, headto, speed, acceleration)
42Called version 2
43
44>>> add_bullet(sprite, script)
45Called version 3
46
47>>> add_bullet(sprite, curve, speed)
48Called version 4
49
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