In http://docs.python.org/py3k/tutorial/datastructures.html#comparing-sequences-and-other-types ,
The operators is and is notcompare whether two objects are really the same > object; > this only matters for mutable objects like lists. I think this notation may confuse readers of the tutorial. For example, pep8 recommands using is operator for immutable singleton objects like None. Shall we remove letter part? -- INADA Naoki <songofaca...@gmail.com>
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