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Running bash script from within python
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The os.system documentation specifically recommends avoiding it in favor of subprocess (these days, subprocess.run()). If you can't get subprocess to work, chances are you'll have trouble with os.system() too.
– tripleee
Jun 2 at 2:03
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In-place edits with sed on OS X
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You can use the -i flag correctly by providing it with a suffix to add to the backed-up file. Extending your example:
sed -i.bu 's/oldword/newword/' file1.txt
Will give you two files: one with the name file1.txt that contains the substitution, and one with the n...
How to check if NSString begins with a certain character
... CFStringHasPrefix() can also be used on NSStrings due to "Toll Free Bridging". The performance of CFStringHasPrefix() seems to be 2-3 times better (at least when using my data set). So if you are using it in a performance sensitive area, you might want to try CFStringHasPrefix() instead.
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Is calculating an MD5 hash less CPU intensive than SHA family functions?
...comparable efforts at optimizations; thus the speed differences can be considered as really intrinsic to the functions.
As a point of comparison, consider that a recent hard disk will run at about 100 MB/s, and anything over USB will top below 60 MB/s. Even though SHA-256 appears "slow" here, it is...
Releasing memory in Python
...ory_info.
import os
import gc
import psutil
proc = psutil.Process(os.getpid())
gc.collect()
mem0 = proc.get_memory_info().rss
# create approx. 10**7 int objects and pointers
foo = ['abc' for x in range(10**7)]
mem1 = proc.get_memory_info().rss
# unreference, including x == 9999999
del foo, x
mem...
Resetting a setTimeout
... @Cort3z that's because window.setTimeout returns a number (the timer's ID) and not a "timeout object".
– Dan O
Apr 30 '15 at 15:59
2
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How to pull request a wiki page on GitHub?
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Put your documentation into the git repository together with the code inside a documentation folder.
Extend your travis-ci build with some magic that stages all changes from that documentation folder with transformations applied to the wiki git. See last example link below.
Consider the wiki as r...
AngularJS - Access to child scope
...pe.$$childHead; cs; cs = cs.$$nextSibling) {
// cs is child scope
}
Fiddle
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py2exe - generate single executable file
...h does
not require extracting files to a
temporary location, which provides
much faster program startup.
Valid values for bundle_files are:
3 (default) don't bundle
2 bundle everything but the Python interpreter
1 bundle everything, including the Python interpreter
I...
Why in Java 8 split sometimes removes empty strings at start of result array?
...we observe the following clause being added:
When there is a positive-width match at the beginning of the input sequence then an empty leading substring is included at the beginning of the resulting array. A zero-width match at the beginning however never produces such empty leading substring.
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