[issue27078] Make f'' strings faster than .format: BUILD_STRING opcode?

[Antti Haapala]

Antti Haapala added the comment:

I tried to post a comment on rietveld, but 500 infernal error...

PyUnicode_New(0, 0) will return unicode_empty. If unicode_empty is NULL, then it will also initialize it. It would be cleanest if unicode_empty was statically created.

NULL cannot be used as the separator argument to `PyUnicode_Join(PyObject *separator, PyObject *seq)` to mean an empty string, as it already means ' ' (space!).

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<http://bugs.python.org/issue27078>
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