[issue5094] datetime lacks concrete tzinfo impl. for UTC

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

The stated long-term goal of the stdlib is to minimize the C extension modules to only those that have to be written in C (modules can still have performance enhancing extension back-ends). Since datetime does not meet that requirement it's not a matter of "if" but "when" datetime will get a pure Python version and use the extension code only for performance.

If someone wants to implement the C code for a tzinfo concrete class that we are talking about, that's fine. But that will not prevent datetime from getting a pure Python version at some point.

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<http://bugs.python.org/issue5094>
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