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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 01c4a0af73cf by Victor Stinner in branch 'default':
Issue #19512, #19515: remove shared identifiers, move identifiers where they
http://hg.python.org/cpython/rev/01c4a0af73cf

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