Python 问题，class rectangle 15
CompleteclassRectangleCollection,whichhasonelistinstancevariable,rectangles,thatshoul...
Complete class RectangleCollection, which has one list instance variable, rectangles, that should initially refer to an empty list. Write a methodadd_rectangle that takes a Rectangle as a parameter and appends it to the rectangles list. Write a method get_same_area_rects that takes a number as a parameter and returns a list of all Rectangles from the rectangles list that have that area.
class Rectangle:
""" A rectangle with a width and height. """
def __init__(self, w, h):
""" (Rectangle, number, number)
Create a new rectangle of width w and height h.
>>> r = Rectangle(1, 2)
>>> r.width
1
>>> r.height
2
"""
self.width = w
self.height = h
def get_area(self):
""" (Rectangle) -> number
Return the area of this rectangle.
>>> r = Rectangle(10, 20)
>>> r.get_area()
200
"""
return self.width * self.height
class RectangleCollection:
def __init__(self):
""" (RectangleCollection) -> NoneType
>>> rc = RectangleCollection()
>>> rc.rectangles
[]
""" 展开
class Rectangle:
""" A rectangle with a width and height. """
def __init__(self, w, h):
""" (Rectangle, number, number)
Create a new rectangle of width w and height h.
>>> r = Rectangle(1, 2)
>>> r.width
1
>>> r.height
2
"""
self.width = w
self.height = h
def get_area(self):
""" (Rectangle) -> number
Return the area of this rectangle.
>>> r = Rectangle(10, 20)
>>> r.get_area()
200
"""
return self.width * self.height
class RectangleCollection:
def __init__(self):
""" (RectangleCollection) -> NoneType
>>> rc = RectangleCollection()
>>> rc.rectangles
[]
""" 展开
展开全部
class Rectangle(object):
def __init__(self,w,h):
self.width=w
self.height=h
def get_area(self):
return self.width*self.height
class RectangleCollection(object):
def __init__(self):
self.rectangles=[]
def add_rectangle(self,rect):
self.rectangles.append(rect)
def get_same_area_rects(self,area):
rects=[]
for rect in self.rectangles:
if area==rect.get_area():
rects.append(rect)
return rects
if __name__=='__main__':
rs=RectangleCollection()
for w,h in [(3,5),(2,4),(10,2),(3,3),(2,6),(3,8),(4,3),(5,4),(12,2),(6,4)]:
rs.add_rectangle(Rectangle(w,h))
print 'rectangles information:'
for index,rect in enumerate(rs.rectangles):
print 'rectangles[%d]: width=%2d,height=%2d,area=%2d'%\
(index,rect.width,rect.height,rect.get_area())
for area in (12,24,20,15):
print 'rectangles with area %d:'%area
for index,rect in enumerate(rs.get_same_area_rects(area)):
print 'rectangles[%d]: width=%2d,height=%2d,area=%2d'%\
(index,rect.width,rect.height,rect.get_area())
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