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str performance in python
While profiling a piece of python code ( python 2.6 up to 3.2 ), I discovered that the
str method to convert an object (in my case an integer) to a string is almost an order of magnitude slower than using string formatting.
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How to remove all leading zeroes in a string
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answered Feb 23 '11 at 23:36
lonesomedaylonesomeday
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Rename Pandas DataFrame Index
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243
The rename method takes a dictionary for the index which applies to index values.
You want to re...
Maven check for updated dependencies in repository
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[INFO] Total time: 17 seconds
[INFO] Finished at: Fri Aug 15 10:46:03 IST 2008
[INFO] Final Memory: 10M/167M
[INFO] ------------------------------------------------------------------------
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Getting the count of unique values in a column in bash
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153
To see a frequency count for column two (for example):
awk -F '\t' '{print $2}' * | sort | uniq...
Access an arbitrary element in a dictionary in Python
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13 Answers
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How do I find out if first character of a string is a number?
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edited Oct 2 '12 at 14:13
answered Aug 3 '09 at 15:43
Mic...
Does the ternary operator exist in R?
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306
As if is function in R and returns the latest evaluation, if-else is equivalent to ?:.
> a...
How to create a video from images with FFmpeg?
...ideo filter instead of -r for the output framerate
ffmpeg -r 1/5 -i img%03d.png -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4
Alternatively the format video filter can be added to the filter chain to replace -pix_fmt yuv420p like "fps=25,format=yuv420p". The advantage of this method is tha...
What's the difference between echo, print, and print_r in PHP?
...4) {
[0]=>
int(0)
[1]=>
float(0)
[2]=>
bool(false)
[3]=>
string(0) ""
}
Array
(
[0] => 0
[1] => 0
[2] =>
[3] =>
)
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