创建一个可以打印角坐标的python Rectangle对象类 [英] Creating a python Rectangle object class that can print the corner coordinates
问题描述
我是 Python 新手.我需要创建一个 python Rectangle
对象类,当调用它时,可以打印角的坐标以及面积和周长.当我尝试运行我的代码时遇到问题:
I am new to python. I need to create a python Rectangle
object class that when called upon one can print the coordinates of the corners as well as have the area and perimeter. I am having issues when I try to run my code that says:
<__main__.Rectangle instance at 0x02F20030>
我被告知也要添加 __str__
但后来我得到:
I was told to add the __str__
as well but then I get:
TypeError: __str__ returned non-string (type int)
任何帮助将不胜感激,谢谢!
Any help would be appreciated, thanks!
class Rectangle:
def __init__(self, topLeft, topRight, bottomLeft, bottomRight):
self.tL = topLeft
self.tR = topRight
self.bL = bottomLeft
self.bR = bottomRight
def perim(self):
return (2 * (self.tL + self.tR)) + (2 * (self.bL + self.bR))
def area(self):
return (self.tL + self.tR) * (self.bL + self.bR)
def position(self):
return self.tL
return self.tR
return self.bL
return self.bR
def __repr__(self):
return self.tL
return self.tR
return self.bL
return self.bT
r1 = Rectangle (5, 5, 10, 10)
print r1
推荐答案
试试这个:
def __repr__(self):
return 'tL = '+str(self.tL) + ', tR ='+ str(self.tR)+', bL ='+ str(self.bL) + ', bR =' +str(self.bR)
注意事项:
- 在一个函数中只执行一个
return
语句,在你的代码中你的函数只返回 self.bT(最后一个). - 在提供的代码中
def __repr__(self)
没有缩进. - 定义矩形不需要 4 个点.
- 您的矩形角不应该只是整数,它们必须是两个坐标 (x, y) 的序列,例如 (3, 7) 是一个点,将一个点实现为 2 个整数元组或列表.立>
- make only one
return
statement execute in a function, in your code your function only returns self.bT (the last). - In the provided code
def __repr__(self)
is not indented. - you don't need 4 points to define a rectangle.
- your Rectangle corners shouldn't just be integers, they have to be sequences of two coordinates (x, y) for instance (3, 7) is a point, implement a point as a 2 integers tuple or list.
正如 OP 所问,这里是如何更改您的 __init__
方法以使用笛卡尔坐标:
edit:
as the OP asked, here's how to change your __init__
method to work with cartesian coordinates:
class Rectangle:
def __init__(self, tL, bR): #tL and bR should be passed as tuples
self.tL = tL
self.tR = (bR[0], tL[1]) #access tuple elements with tuple[index]
self.bL = (bR[1], tL[0])
self.bR = bR
self.width = bR[0]- tL[0]
self.height = bR[1] - tL[1]
def area(self):
#get area
#...
def perim(self):
#get perim
#...
r1 = Rectangle((5,5), (30, 20))
print r1.tL #output (5, 5)
print r1.tR #output (30, 5)
print r1.width #output 25
print r1.area() #output 375
当然你可以创建一个Point class
来代替那个,然后你将两个Point
传递给__init__
来定义矩形.
of course you can create a Point class
instead of that, and then you pass two Point
s to __init__
to define the rectangle.
希望对你有帮助!
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