求注释
import mathclass Point():
def __init__(self, x=0, y=0):
self.x = x
self.y = y
def getX(self):
return self.x
def getY(self):
return self.y
class Line():
def __init__(self, p1, p2):
self.x = p1.getX() - p2.getX()
self.y = p1.getY() - p2.getY()
self.len = math.sqrt(self.x*self.x + self.y*self.y)
def getLen(self):
return self.len
>>> p1 = Point(1, 1)
>>> p2 = Point(4, 5)
>>> line = Line(p1, p2)
>>> line.getLen()
5.0
class Point():
def __init__(self, x=0, y=0): #重写init方法，传入两参数x,y,默认值为0
self.x = x #将参数分别赋值给属性
self.y = y
def getX(self): #返回x属性
return self.x
def getY(self): #返回y属性
return self.y
class Line():
def __init__(self, p1, p2): #重写init方法，传入两point类的对象
self.x = p1.getX() - p2.getX()#初始化x,y属性，其值为两point对象x,y属性的差值
self.y = p1.getY() - p2.getY()
self.len = math.sqrt(self.x*self.x + self.y*self.y) #调用math库求出根号下二者的平方和
def getLen(self): #返回len属性
return self.len
>>> p1 = Point(1, 1) #实例化两个point对象
>>> p2 = Point(4, 5)
>>> line = Line(p1, p2) #两point对象作为参数，实例化一个line对象
>>> line.getLen() #返回长度
页:
[1]