>>> a = 100; b = 100; print (a is b) True >>> a = 1000; ... | Hacker News

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dtf on Dec 19, 2011 | parent | context | favorite | on: The switch: Python to Node.js

>>> a = 100; b = 100; print (a is b)

True

>>> a = 1000; b = 1000; print (a is b)

True

>>> a = 1000

>>> b = 1000

>>> print (a is b)

False

Python has its quirks too. Most people learn them and get over it.

zeemonkee on Dec 19, 2011 | [–]

This might be a good explanation for this behavior:

http://stackoverflow.com/questions/2858603/why-is-keyword-ha...

tl;dr; use "is" only with singetons (None etc)

sneak on Dec 19, 2011 | [–]

I have never once used the 'is' keyword in python.

dtf on Dec 19, 2011 | [–]

Have you ever tested for a None value?

    if foo is None:
      return

    if bar is not None:
      bar()

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