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executable file
·77 lines (57 loc) · 1.37 KB
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#!/usr/bin/env python
"""
Circle class -- an example class with a few properties
This version with doctests...
"""
import math
class Circle(object):
"""
A class that defines a circle.
You can get and set either the radius or the diameter with properties.
setable:
Circle.radius
Circle.diameter
getable:
Circle.area
Example:
>>> c = Circle(4)
>>> c.radius
4.0
>>> c.diameter
8.0
>>> c.diameter = 4
>>> c.radius
2.0
>>> c.area
12.566370614359172
>>> c2 = Circle(6)
>>> c + c2
Circle(8.000000)
>>> str(c2)
'Circle Object with radius: 6.000000'
>>>
"""
def __init__(self, radius):
"""
Initialize a new Circle
:param radius: the radius of the circle
"""
self.radius = float(radius)
@property
def diameter(self):
return self.radius * 2.0
@diameter.setter
def diameter(self, value):
self.radius = value / 2.0
@property
def area(self):
return self.radius**2 * math.pi
def __add__(self, other):
return Circle(self.radius + other.radius)
def __repr__(self):
return "Circle(%f)"%self.radius
def __str__(self):
return "Circle Object with radius: %f"%self.radius
if __name__ == "__main__":
import doctest
print doctest.testmod()