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F-strings are much faster: In [4]: a, b, c, d = ("123", "456", "789", "0ab")
In [5]: %timeit a + "-" + b
139 ns ± 10 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
In [6]: %timeit "%s-%s" % (a, b)
198 ns ± 13.8 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
In [7]: %timeit "{}-{}".format(a, b)
248 ns ± 9.17 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [8]: %timeit f"{a}-{b}"
99 ns ± 2.48 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
In [9]: %timeit a + "-" + b + "-" + c + "-" + d
344 ns ± 10.3 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [11]: %timeit "%s-%s-%s-%s" % (a, b, c, d)
290 ns ± 9.64 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [12]: %timeit ''.join([a, '-', b, '-', c, '-', d])
245 ns ± 2.32 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [13]: %timeit "{0}-{1}-{2}-{3}".format(a, b, c, d)
471 ns ± 23.6 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
In [14]: %timeit f"{a}-{b}-{c}-{d}"
176 ns ± 11.9 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
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