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add a string prefix to each value in a string column using Pandas
...dtype=str
or convert column type to string df['a'] = df['a'].astype(str)
then you can use such approach:
df['a']= 'col' + df['a'].str[:]
This approach allows prepend, append, and subset string of df.
Works on Pandas v0.23.4, v0.24.1. Don't know about earlier versions.
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Difference between decimal, float and double in .NET?
...say this any more plainly: In C, if you do double a = 0.1; double b = 0.1; then a == b will be true. It's just that a and b will both not exactly equal 0.1. In C#, if you do decimal a = 1.0m / 3.0m; decimal b = 1.0m / 3.0m; then a == b will also be true. But in that case, neither of a nor b will ex...
How to exclude a file extension from IntelliJ IDEA search?
...ted to be able to add it to project settings one time and be done with it, then here's a solution for you.
I wanted my Find in Path to not search in lock files (auto-generated manifest file by package managers), here's what I had to do for that:
Goto File >> Project Structure (or just pres...
What is the difference between ndarray and array in numpy?
...e are two modes of creating an array using __new__:
If buffer is None, then only shape, dtype, and order are used.
If buffer is an object exposing the buffer interface, then all keywords are interpreted.
The example below gives a random array because we didn't assign buffer value:
np.ndar...
Code coverage with Mocha
...lly, and add the following to the scripts section of your package.json and then just npm run coverage: "coverage": "./node_modules/istanbul/lib/cli.js cover ./node_modules/mocha/bin/_mocha -- --ui bdd -R spec -t 5000
– Dan Kohn
May 20 '13 at 4:49
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Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
... I would say that using %f in printf is a good habit because then your code always works, whereas using %lf may fail if the compiler does not have a C99 compliant library. Unfortunately that situation does happen in reality.
– M.M
May 22 '16 at 4:...
What is Linux’s native GUI API?
... drawing to screen etc (and communicates with graphics drivers). Gnome/KDE then control X11. That's about it at a high level and ignoring a billion and one details.
– slugonamission
Oct 3 '12 at 21:36
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What is move semantics?
...stead of deeply copying the heap data, we have just copied the pointer and then set the original pointer to null (to prevent 'delete[]' from source object's destructor from releasing our 'just stolen data'). In effect, we have "stolen" the data that originally belonged to the source string. Again, t...
In CMake, how can I test if the compiler is Clang?
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If your cmake_minimum_required VERSION is less than 3.1, then you have to use quoted variable to determine compiler, if together with STREQUAL command, i.e.
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
MESSAGE("MSVC")
endif()
Or, if you don't like quoted stuff, you can use MA...
How to commit no change and new message?
...llow the git flow branch model. When you make a dev branch form master and then a feat branch immediately from dev, the feat branch looks to come from the master branch as there is no distinguishing commit on the dev branch which the feat branch comes from. An empty commit when you first make the de...