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add a string prefix to each value in a string column using Pandas
... @RomanPekar's solution (python 3.6.4):
df = pd.DataFrame({'col':['a', 0]*200000})
%timeit df['col'].apply(lambda x: f"str{x}")
117 ms ± 451 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
%timeit 'str' + df['col'].astype(str)
112 ms ± 1.04 ms per loop (mean ± std. dev. of 7 runs, 10...
Understanding spring @Configuration class
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edited Jan 19 '19 at 20:37
answered Jun 3 '14 at 12:12
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What's a correct and good way to implement __hash__()?
...te a problem ?
– Mr Matrix
Jan 5 at 20:11
1
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Error “initializer element is not constant” when trying to initialize variable with const
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edited Dec 23 '19 at 20:27
Community♦
111 silver badge
answered Jun 11 '10 at 18:04
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How do I convert CamelCase into human-readable names in Java?
...t work. Thanks!
– gmm
Jan 7 '13 at 20:08
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GlobalConfiguration.Configure() not present after Web API 2 and .NET 4.5.1 migration
... Was added automatically when I added a API controller. I had to restart VS2015 to get it going. I also did everything else recommended on this page so not sure what was the actual problem.
– Piotr Kula
May 1 '15 at 9:38
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Why doesn't println! work in Rust unit tests?
...oblem?
– superlogical
Jul 16 '15 at 20:55
6
As has been pointed out in previous comments, the opt...
Find the last element of an array while using a foreach loop in PHP
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answered Mar 20 '09 at 6:05
Richard LevasseurRichard Levasseur
12.3k55 gold badges4545 silver badges6060 bronze badges
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File name? Path name? Base name? Naming standard for pieces of a path
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edited Mar 17 '16 at 20:43
wisbucky
19.4k88 gold badges8787 silver badges7272 bronze badges
answere...
echo that outputs to stderr
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edited Mar 16 '16 at 20:33
answered Jun 7 '10 at 14:52
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