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How to keep index when using pandas merge
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In [5]: a.reset_index().merge(b, how="left").set_index('index')
Out[5]:
col1 to_merge_on col2
index
a 1 1 1
b 2 3 2
c 3 4 NaN
Note that for some left merge operations, you may en...
Removing leading zeroes from a field in a SQL statement
I am working on a SQL query that reads from a SQLServer database to produce an extract file. One of the requirements to remove the leading zeroes from a particular field, which is a simple VARCHAR(10) field. So, for example, if the field contains '00001A', the SELECT statement needs to return the...
Difference between binary semaphore and mutex
Is there any difference between a binary semaphore and mutex or are they essentially the same?
34 Answers
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Delete all local git branches
I follow a development process where I create a new local branch for every new feature or story card. When finished I merge the branch into master and then push.
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Order data frame rows according to vector with specific order
...cording to a "target" vector as the one I implemented in the short example below?
5 Answers
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Sequence-zip function for c++11?
With the new range-based for loop we can write code like
13 Answers
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Opposite of %in%: exclude rows with values specified in a vector
A categorical variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%
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How to add a progress bar to a shell script?
When scripting in bash or any other shell in *NIX, while running a command that will take more than a few seconds, a progress bar is needed.
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How to remove the first Item from a list?
...st [0, 1, 2, 3, 4] I'd like to make it into [1, 2, 3, 4] . How do I go about this?
10 Answers
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How to toggle a boolean?
Is there a really easy way to toggle a boolean value in javascript ?
6 Answers
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