Facts and myths about Python names and values

Re:Facts and myths about Python names and values by RodericDay on Sunday July 14, 2013 @12:52PM (#6041345)

I think two different objects that evaluate to the same thing pass the `==` test, but is checks for identity?

  >>> a = list()
  >>> b = list()
  >>> a is b
  False
  >>> a==b
  True
  >>>

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Re:Facts and myths about Python names and values by nslocum on Sunday July 14, 2013 @12:55PM (#6041354)

You're correct.

Further, there are some odd quirks because of the way Python caches small Integers for efficiency.

  > 2 + 2 is 4
  True
  > 1000 + 1 is 1001
  False

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Re:Facts and myths about Python names and values by audeyisaacs on Sunday July 14, 2013 @02:04PM (#6041576)

For more details:

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Re:Facts and myths about Python names and values by nslocum on Sunday July 14, 2013 @02:27PM (#6041660)

After a little trial and error, it appears that Python caches the values in range(-5,257).

  > -6 + 0 is -6
  False
  > -5 + 0 is -5
  True
  > 256 + 0 is 256
  True
  > 257 + 0 is 257
  False

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Re:Facts and myths about Python names and values by wahnfrieden on Sunday July 14, 2013 @04:43PM (#6042166)

(CPython)

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Re:Facts and myths about Python names and values by Thrymr on Sunday July 14, 2013 @01:11PM (#6041402)

    > 2 + 4 is 4
    True

I sure hope not.

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Re:Facts and myths about Python names and values by nslocum on Sunday July 14, 2013 @02:21PM (#6041629)

lol, thanks, i fixed it

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Re:Facts and myths about Python names and values by alecrn on Sunday July 14, 2013 @01:12PM (#6041403)

(I think you meant 2 + 2 is 4)

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