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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
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%timeit df["A1"], df["A2"] = zip(*df["a"].apply(calculate))
159 ms ± 5.24 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
60x faster than zip
In general, avoid using apply
Apply is generally not much faster than iterating over a Python list. Let's test the performance of a for-loo...
Difference between setUp() and setUpBeforeClass()
...zej Doyle
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Bash script - variable content as a command to run
...00/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 45...
Chrome/jQuery Uncaught RangeError: Maximum call stack size exceeded
...antrung -cunconvantrung -cuncon
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Why is $$ returning the same id as the parent process?
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$$ is defined to return the process ID of the parent in a subshell; from the man page under "Sp...
Regex lookahead for 'not followed by' in grep
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edited Dec 19 '17 at 17:24
answered Jan 6 '16 at 3:50
dou...
How do I ignore the initial load when watching model changes in AngularJS?
...this flag hack
– Charlie Martin
Feb 24 '15 at 19:27
2
MW's answer is actually incorrect as the ne...
Difference between Label and TextBlock
...00/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 45...
“Server” vs “Data Source” in connection string
...00/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 45...
Do fragments really need an empty constructor?
...ts.
– Chris.Jenkins
Feb 4 '13 at 12:24
1
@Chris.Jenkins Well, that, then, was my ignorance of Par...