Benjamin Peterson <benja...@python.org> added the comment:

"is" compares by identity not equality. Since tuples are immutable, the 
interpreter is free to reuse or not reuse the same tuple instance when it 
appears multiple times in a program. This is an implementation detail not a bug.

----------
nosy: +benjamin.peterson
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38666>
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