[issue19512] Avoid temporary Unicode strings, use identifiers to only create the string once

[STINNER Victor]

STINNER Victor added the comment:

>> Another problem is that PyUnicode_FromString() failure is not handled correctly in some cases. PyUnicode_FromString() can fail because an decoder error, but also because of a MemoryError.

> It can't fail on "stdout" because an decoder error.

It can fail on "stdout" because of a memory allocation failure.

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