Is there a difference between `==` and `is` in Python?

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There is a simple rule of thumb to tell you when to use == or is.

  • == is for value equality. Use it when you would like to know if two objects have the same value.
  • is is for reference equality. Use it when you would like to know if two references refer to the same object.
>>> a = 500
>>> b = 500
>>> a == b
True
>>> a is b
False

 

 

注： 判断None的只能用xxx is None来做

 

ref: http://stackoverflow.com/questions/132988/is-there-a-difference-between-and-is-in-python

https://segmentfault.com/q/1010000000150947

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