[英]Python - operator overloading in vector math
碼:
class Vector:
def __init__(self):
self.x = 0.0
self.y = 0.0
def __mul__(self, scalar):
v = Vector()
v.x = self.x * scalar
v.y = self.y * scalar
return v
v = Vector()
v.x = 2
v.y = 5
v = v * 2
問題:有沒有辦法以一種可能的方式重載mul運算符:
v = 2 * v
?
使用__rmul__
:
def __rmul__(self, scalar): # self: right operand (Vector)
v = Vector()
v.x = self.x * scalar
v.y = self.y * scalar
return v
__rmul__
稱為當左邊的操作數不支持相應的操作( __mul__
)。
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