Serhiy Storchaka added the comment:
Proposed patch adds the BUILD_STRING opcode and speeds up PyObject_Format() in
common cases. It makes f-strings the fastest method for simple formatting.
$ ./python -m timeit -s "x = 2" -- 'f"X is {x}"'
1000000 loops, best of 3: 0.347 usec per loop
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Added file: http://bugs.python.org/file43708/fstring_build_string.patch
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<http://bugs.python.org/issue27078>
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