Python:使用dict派生类 - self = {的奇怪行为

Question

A级和B级有什么区别？

自我有什么问题？

为什么我需要逐行声明自己？

class A(dict):
  def __init__(self):
    self={1:"you", 2:"and me"}
    print "inside of class A",self
class B(dict):
  def __init__(self):
    self[1]="you"
    self[2]="and me"
    print "inside of class B",self

a=A()
print "outside of class A",a
b=B()
print "outside of class B",b

结果:

inside of class A {1: 'you', 2: 'and me'}
outside of class A {}
inside of class B {1: 'you', 2: 'and me'}
outside of class B {1: 'you', 2: 'and me'}

Answer 1

  def __init__(self):
    self={1:"you", 2:"and me"}

这不会修改传递的对象self,但会将局部变量重新绑定self到新的dict.