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PostgreSQL, checking date relative to “today”
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Note that now() is a timestamp, so this range will also only include part of the day from exactly a year ago and part of the day today. If you want to filter on full days, cast now()::date as Alex Howansky suggested.
– tokenizer_fsj
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When to use volatile with multi threading?
...echanism for a release store to only flush itself and a few select address-ranges: it would have to sync everything because it wouldn't know what other threads might want to read if their acquire-load saw this release-store (forming a release-sequence that establishes a happens-before relationship a...
Are there any JavaScript static analysis tools? [closed]
... static analysis of JavaScript code. This enables Burp Scanner to report a range of new vulnerabilities, including:
DOM-based XSS
JavaScript injection
Client-side SQL injection
WebSocket hijacking
Local file path manipulation
DOM-based open redirection
Cookie manipulation
Ajax request header manipu...
Disable cache for some images
...y other) field, you'll need several headers to get the desired effect on a range of browsers.
header ("Pragma-directive: no-cache");
header ("Cache-directive: no-cache");
header ("Cache-control: no-cache");
header ("Pragma: no-cache");
header ("Expires: 0");
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matplotlib colorbar for scatter
... you?
import matplotlib.pyplot as plt
cm = plt.cm.get_cmap('RdYlBu')
xy = range(20)
z = xy
sc = plt.scatter(xy, xy, c=z, vmin=0, vmax=20, s=35, cmap=cm)
plt.colorbar(sc)
plt.show()
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impro...
Generate random numbers with a given (numerical) distribution
...yword parameter to numpy.random.choice(), e.g.
numpy.random.choice(numpy.arange(1, 7), p=[0.1, 0.05, 0.05, 0.2, 0.4, 0.2])
If you are using Python 3.6 or above, you can use random.choices() from the standard library – see the answer by Mark Dickinson.
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How to get the last element of a slice?
... I am not sure but I got panic: runtime error: index out of range for profiles[len(profiles)-1].UserId, I guess the length of the slice is 0 so it panics?
– tom10271
Aug 16 '19 at 2:20
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Numpy: find first index of value fast
..."""return the index of the first occurence of item in vec"""
for i in xrange(len(vec)):
if item == vec[i]:
return i
return -1
and then:
>>> a = array([1,7,8,32])
>>> find_first(8,a)
2
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Find element's index in pandas Series
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In [4]: myseries = pd.Series(data, index=range(1,26))
In [5]: myseries[21]
Out[5]: 150
In [7]: %timeit myseries[myseries == 150].index[...
How to search through all Git and Mercurial commits in the repository for a certain string?
..."search for this" [file...]
There are other options that narrow down the range of revisions that are searched.
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