Python 'is' vs JavaScript ===

Question

The Python use of \'is\' seems to be similar to JavaScript \'===\' but not quite.

Here they talk about exact instances: http://www.learnpython.org/en/Conditions

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Answer 1

Completely different.

>>> a = 'foo'
>>> b = 'bar'
>>> a + b is 'foobar'
False
>>> 1000 + 1 is 1001
False