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Prepend a level to a pandas MultiIndex
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A nice way to do this in one line using pandas.concat():
import pandas as pd
pd.concat([df], keys=['Foo'], names=['Firstlevel'])
An even shorter way:
pd.concat({'Foo': df}, names=['Firstlevel'])
This can be generalized to many data frames, see the docs.
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How is performance affected by an unused using directive?
...rformance of your application.
It can affect the performance of the IDE and the overall compilation phase. The reason why is that it creates an additional namespace in which name resolution must occur. However these tend to be minor and shouldn't have a noticeable impact on your IDE experience ...
Git rebase fails, 'Your local changes to the following files would be overwritten by merge'. No loca
...e upstream changes pulled into master since the bugfix branch was created, and it now refuses to rebase.
2 Answers
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Need to understand the usage of SemaphoreSlim
Here is the code I have but I don't understand what SemaphoreSlim is doing.
3 Answers
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A list of indices in MongoDB?
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And if you want to get list of all indexes in your database:
use "yourdbname"
db.system.indexes.find()
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Javascript split regex question
...e ability to split a date via javascript splitting either by a '-','.','/' and ' '.
7 Answers
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Take diff of two vertical opened windows in Vim
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The :windo command makes it even better. Thanks. I'll will map it to make it easier.
– Fatih Arslan
Dec 8 '10 at 10:21
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Using a remote repository with non-standard port
... for a remote repository. The remote repository is being served on a non-standard port (4019).
5 Answers
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Visual Studio Expand/Collapse keyboard shortcuts [duplicate]
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Collapse to definitions
CTRL + M, O
Expand all outlining
CTRL + M, X
Expand or collapse everything
CTRL + M, L
This also works with other languages like TypeScript and JavaScript
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Insert the carriage return character in vim
...Ctrl-V tells vi that the next character typed should be inserted literally and ctrl-m is the keystroke for a carriage return.
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