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add a string prefix to each value in a string column using Pandas
...', 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 loops each)
Using format, however, is indeed far slower:
%timeit ...
What is the best way to convert an array to a hash in Ruby
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NOTE: For a concise and efficient solution, please see Marc-André Lafortune's answer below.
This answer was originally offered as an alternative to approaches using flatten, which were the most highly upvoted at the time of writing. I should have clarified that I didn't intend to presen...
In Javascript, how to conditionally add a member to an object?
... answered Jul 28 '12 at 20:45
Frédéric HamidiFrédéric Hamidi
232k3737 gold badges445445 silver badges455455 bronze badges
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How can I strip all punctuation from a string in JavaScript using regex?
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@AntoineLizée I agree that it's misleading. Updated the answer. Thanks.
– Mike Grace
Jan 12 '16 at 0:52
2
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Pseudo-terminal will not be allocated because stdin is not a terminal
...ize the content of $1 at all.
– Cristian Matthias Ambæk
Aug 26 '16 at 9:33
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@mklement0 Sure, yo...
Single Page Application: advantages and disadvantages [closed]
...t questions' searchability from a search engine).
– sçuçu
Apr 27 '16 at 17:15
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Most SPA apps I...
Equivalent of “throw” in R
...itations. Here stackoverflow.com/a/23917007/54964
– Léo Léopold Hertz 준영
Oct 30 '16 at 10:51
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Confused about Service vs Factory
...example. Do you know how i should annotate this?
– Pål
Oct 2 '14 at 13:56
2
Yes, there is there...
Is it possible dynamically to add String to String.xml in Android?
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However, you should also read Elias Mårtenson's answer on Android plurals treatment of “zero”. There is a problem with the interpretation of certain values such as "zero".
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UITableView row animation duration and completion callback
... answered Jan 27 '17 at 8:39
Frédéric AddaFrédéric Adda
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