# 实现向量类型
class Vector:
 
 def __init__(self, x=0, y=0):
  self.x = x
  self.y = y

class Vector:
 
 def __init__(self, x=0, y=0):
  self.x = x
  self.y = y

 # 实现向量加法
 def __add__(self, other):
  x = self.x + other.x
  y = self.y + other.y
  return Vector(x, y)

class Vector:
 
 def __init__(self, x=0, y=0):
  self.x = x
  self.y = y

 # 实现向量加法
 def __add__(self, other):
  x = self.x + other.x
  y = self.y + other.y
  return Vector(x, y)
 
 # 实现向量乘法，例如r*3
 def __mul__(self, scalar):
  return Vector(self.x*scalar, self.y*scalar)

class Vector:
 
 def __init__(self, x=0, y=0):
  self.x = x
  self.y = y
 
 # 真假值，如果向量模为0，返回false
 def __bool__(self):
  return bool(abs(self))

 # 实现向量加法
 def __add__(self, other):
  x = self.x + other.x
  y = self.y + other.y
  return Vector(x, y)
 
 # 实现向量乘法，例如r*3
 def __mul__(self, scalar):
  return Vector(self.x*scalar, self.y*scalar)

 
 # 返回向量的模
 # hypot()返回欧几里德范数 sqrt(x*x + y*y)
 def __abs__(self):
  return hypot(self.x, self.y)

v = Vector(2, 3)
print(v)
v2 = Vector(4, 5)
print(v+v2)
print(v+v2*2)

<__main__.Vector object at 0x000002B4B1843C50>
<__main__.Vector object at 0x000002B4B1843EF0>
<__main__.Vector object at 0x000002B4B1843898>

class Vector:
 
 def __init__(self, x=0, y=0):
  self.x = x
  self.y = y
 
 # 真假值，如果向量模为0，返回false
 def __bool__(self):
  return bool(abs(self))

 # 实现向量加法
 def __add__(self, other):
  x = self.x + other.x
  y = self.y + other.y
  return Vector(x, y)
 
 # 实现向量乘法，例如r*3
 def __mul__(self, scalar):
  return Vector(self.x*scalar, self.y*scalar)
 
 # 返回向量的模
 # hypot()返回欧几里德范数 sqrt(x*x + y*y)
 def __abs__(self):
  return hypot(self.x, self.y)
 
 # 实现__repr__方法，在控制台打印向量时会输出Vector(1, 2)
 # 实现__str__，使用str()返回字符串
 def __repr__(self):
  return 'Vector(%r, %r)' % (self.x, self.y)

v = Vector(2, 3)
print(v)
v2 = Vector(4, 5)
print(v+v2)
print(v+v2*2)
print(abs(v))

Vector(2, 3)
Vector(6, 8)
Vector(10, 13)
3.605551275463989