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Iterate an iterator by chunks (of n) in Python? [duplicate]
...for small n, but for large groups, is very inefficient. My n, e.g., is 200,000. Creating a temporary list of 200K items is...not ideal.
– Jonathan Eunice
Apr 24 '15 at 0:02
2
...
Hadoop “Unable to load native-hadoop library for your platform” warning
...14' not found (required by ./libhadoop.so.1.0.0)
linux-vdso.so.1 => (0x00007fff43510000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f9be553a000)
libc.so.6 => /lib64/libc.so.6 (0x00007f9be51a5000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9be5966000)
Unfortunately, I stupidly overlooked the answe...
Git Blame Commit Statistics
...rankenstein snippet with ruby in it, but it works for me flawlessly on 200,000+ LOC, and it sorts the results:
git ls-tree -r HEAD | gsed -re 's/^.{53}//' | \
while read filename; do file "$filename"; done | \
grep -E ': .*text' | gsed -r -e 's/: .*//' | \
while read filename; do git blame "$filen...
Convert SVG to PNG in Python
...rosvg import svg2png
svg_code = """
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<circle cx="12" cy="12" r="10"/>
<line x1="12" y1="8" ...
How do I retrieve an HTML element's actual width and height?
...nd div all with the same css:
width:200px;
height:20px;
border:solid 1px #000;
padding:2px;
<input id="t" type="text" />
<input id="b" type="button" />
<div id="d"></div>
I tried it in chrome, firefox and ie-edge, I tried with jquery and without, and I tried it with and...
Best way to remove from NSMutableArray while iterating?
...sing 4 different methods. Each test iterated through all elements in a 100,000 element array, and removed every 5th item. The results did not vary much with/ without optimization. These were done on an iPad 4:
(1) removeObjectAtIndex: -- 271 ms
(2) removeObjectsAtIndexes: -- 1010 ms (because build...
How do I translate an ISO 8601 datetime string into a Python datetime object? [duplicate]
...e parsing. If you were to get an ISO 8601 string like: 2010-05-08T23:41:54.000Z you'd have a fun time parsing that with strptime, especially if you didn't know up front whether or not the timezone was included. pyiso8601 has a couple of issues (check their tracker) that I ran into during my usage an...
How to sum a variable by group
... will be quite a lot faster than base functions, however (can well be 100-1000 times faster for some operations). Also see here
– talat
Jan 23 '15 at 14:50
...
What's the best way to set a single pixel in an HTML5 canvas?
...ower than the other methods. This may be true if your plotting less than 1000, but from there onwards this method starts winning and then slaughtering the other methods. Here's a test case.... measurethat.net/Benchmarks/Show/8386/0/…
– PAEz
May 27 at 2:11
...
Fastest way to extract frames using ffmpeg?
...
If you know exactly which frames to extract, eg 1, 200, 400, 600, 800, 1000, try using:
select='eq(n\,1)+eq(n\,200)+eq(n\,400)+eq(n\,600)+eq(n\,800)+eq(n\,1000)' \
-vsync vfr -q:v 2
I'm using this with a pipe to Imagemagick's montage to get 10 frames preview from any videos. Obviously t...