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Selecting multiple columns in a pandas dataframe
...of the first two columns) then you can do this instead:
df1 = df.iloc[:, 0:2] # Remember that Python does not slice inclusive of the ending index.
Additionally, you should familiarize yourself with the idea of a view into a Pandas object vs. a copy of that object. The first of the above methods wil...
How to check if a process id (PID) exists
...o something based on the exit code, you can
if ! kill $pid > /dev/null 2>&1; then
echo "Could not send SIGTERM to process $pid" >&2
fi
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Is there a simple way to remove multiple spaces in a string?
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What is self-documenting code and can it replace well documented code? [closed]
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How do I run multiple background commands in bash in a single line?
...background and run sequentially, you would do something like this:
(sleep 2; sleep 3) &
If, on the other hand, you would like them to run in parallel in the background, you can instead do this:
sleep 2 & sleep 3 &
And the two techniques could be combined, such as:
(sleep 2; echo f...
How can I generate a unique ID in Python? [duplicate]
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edited Aug 25 '14 at 21:03
Cydrobolt
6699 bronze badges
answered Jul 31 '09 at 2:54
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Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?
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Sorting list based on values from another list?
...", "b", "c", "d", "e", "f", "g", "h", "i"]
Y = [ 0, 1, 1, 0, 1, 2, 2, 0, 1]
Z = [x for _,x in sorted(zip(Y,X))]
print(Z) # ["a", "d", "h", "b", "c", "e", "i", "f", "g"]
Generally Speaking
[x for _, x in sorted(zip(Y,X), key=lambda pair: pair[0])]
Explained:
zip the two li...
Finding differences between elements of a list
...gt;> [j-i for i, j in zip(t[:-1], t[1:])] # or use itertools.izip in py2k
[2, 3]
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