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Checkout subdirectories in Git?
... change the way sparse checkouts works.
– Anders Lindén
Jun 4 '19 at 14:59
1
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How do I discover memory usage of my application in Android?
...om/2011/11/… if anyone finds it useful.
– Johan Norén
Nov 5 '11 at 10:13
3
What exactly are th...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...void using apply
Apply is generally not much faster than iterating over a Python list. Let's test the performance of a for-loop to do the same thing as above
%%timeit
A1, A2 = [], []
for val in df['a']:
A1.append(val**2)
A2.append(val**3)
df['A1'] = A1
df['A2'] = A2
298 ms ± 7.14 ms per...
How can I use numpy.correlate to do autocorrelation?
...sult, and that should be the autocorrelation you are looking for. A simple python function to do that would be:
def autocorr(x):
result = numpy.correlate(x, x, mode='full')
return result[result.size/2:]
You will, of course, need error checking to make sure that x is actually a 1-d array. ...
What is the difference between \r and \n?
...his post while trying to figure out how to split <textarea> input in Python, and \r\n is actually the only way I could properly split the lines into separate list elements. It makes me wonder if this is some weird HTML artifact, or if it has to do with the way that Python ingests the string fr...
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...
However, the default Python driver for sqlite prevents transactional SQL. bugs.python.org/issue10740
– joeforker
Sep 17 '13 at 18:57
...
Explain the concept of a stack frame in a nutshell
...ynamic languages also have their call stacks, don't they? I mean, if, say, Python wants to execute some procedure, the data about this procedure is stored inside of some Python interpreter's structure, am I correct? So I mean that call stack is present not only at a low level.
–...
What is the rationale for all comparisons returning false for IEEE754 NaN values?
... the nonreflexivity of NaNs has created no end of pain for languages like Python, with its equality-based containment semantics. You really don't want equality to fail to be an equivalence relation when you're trying to build containers on top of it. And having two separate notions of equality is...
Vertical (rotated) text in HTML table
Is there a (portable) way to rotate text in a HTML table cell by 90°?
11 Answers
11
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What is the reason for performing a double fork when creating a daemon?
I'm trying to create a daemon in python. I've found the following question , which has some good resources in it which I am currently following, but I'm curious as to why a double fork is necessary. I've scratched around google and found plenty of resources declaring that one is necessary, but not ...