[docs] [issue13277] tzinfo subclasses information

[Mark Lawrence]

Mark Lawrence added the comment:

I don't understand the implications of timezone stuff at all so can a guru on the subject please comment on this.

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nosy: +BreamoreBoy
versions: +Python 2.7, Python 3.4, Python 3.5

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<http://bugs.python.org/issue13277>
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