[issue19512] Avoid most calls to PyUnicode_DecodeUTF8Stateful() in Python interactive mode

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PySys_GetObject() is called with followed literal strings: argv, displayhook, excepthook, modules, path, path_hooks, path_importer_cache, ps1, ps2, stderr, stdin, stdout, tracebacklimit.

PyDict_GetItemString() is called with followed literal strings: __abstractmethods__, __builtins__, __file__, __loader__, __module__, __name__, __warningregistry__, _abstract_, _argtypes_, _errcheck_, _fields_, _flags_, _iterdump, _needs_com_addref_, _restype_, _type_, builtins, decimal_point, default_int_handler, displayhook, excepthook, fillvalue, grouping, imp, metaclass, options, sys, thousands_sep.

Are any of these calls performance critical?

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue19512>
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