Serhiy Storchaka added the comment:
Yet one case for comparison (with msg270095):
$ ./python -m timeit -s "x = 2" -- 'f"X is {x!s}"'
1000000 loops, best of 3: 0.625 usec per loop
Seems f'{x!s}' is the fastest way to stringify a value. Thus there is an
opportunity to speed up default formatting by special casing PyObject_Format()
for most popular types (str and int).
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27078>
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