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In [8]: %timeit re.sub(r'\s+', ' ', s)
37.4 µs ± 140 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
In [9]: %timeit re.sub(r'\s\s+', ' ', s)
10.8 µs ± 17.9 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
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In [8]: %timeit re.sub(r'\s+', ' ', s)
37.4 µs ± 140 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
In [9]: %timeit re.sub(r'\s\s+', ' ', s)
10.8 µs ± 17.9 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
timeit
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