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99 lines (67 loc) · 1.63 KB
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#!/usr/bin/env python
"""
simple_classes.py
demonstrating the basics of a class
"""
import math
# create a point class
class Point:
def __init__(self, x, y):
self.x = x
self.y = y
# create an instance of that class
p = Point(3, 4)
# access the attributes
print("p.x is:", p.x)
print("p.y is:", p.y)
class Point2:
size = 4
color = "red"
def __init__(self, x, y):
self.x = x
self.y = y
p2 = Point2(4, 5)
print(p2.size)
print(p2.color)
class Point3:
size = 4
color = "red"
def __init__(self, x, y):
self.x = x
self.y = y
def get_color(self):
return self.color
p3 = Point3(4, 5)
print(p3.size)
print(p3.get_color())
class Circle:
color = "red"
styles = ['dashed']
def __init__(self, diameter):
self.diameter = diameter
def grow(self, factor=2):
"""
grows the circle's diameter
:param factor=2: factor by which to grow the circle
"""
self.diameter = self.diameter * factor
def add_style(self, style):
self.styles.append(style)
def get_area(self):
return math.pi * self.diameter / 2.0
class NewCircle(Circle):
color = "blue"
def grow(self, factor=2):
"""grows the area by factor..."""
self.diameter = self.diameter * math.sqrt(2)
nc = NewCircle
print(nc.color)
class CircleR(Circle):
def __init__(self, radius):
diameter = radius*2
Circle.__init__(self, diameter)
class CircleR2(Circle):
def __init__(self, radius):
self.radius = radius
def get_area(self):
return Circle.get_area(self, self.radius*2)