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Difference between subprocess.Popen and os.system
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@JacobMarble so suppose I am calling a selenium scraping script from another python script, which of these would allow me to complete the scraping script and then and only then execute the next line of code? As in, my scraping should complete before the execution can continue.
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How do cache lines work?
...n cache layer.
So a cache basically speeds up memory access greatly (60ns vs. 1ns).
Fetching a value, storing it in the cache for the chance of rereading it is good for variables that are often accessed but for memory copy operations it would be still to slow since one just reads a value, writes t...
How to create correct JSONArray in Java using JSONObject
...employees", ja);
Edit: Since there has been a lot of confusion about put vs add here I will attempt to explain the difference. In java 6 org.json.JSONArray contains the put method and in java 7 javax.json contains the add method.
An example of this using the builder pattern in java 7 looks some...
How to search for “R” materials? [closed]
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I would just add, one great way to search for R script is to type your search term into google with "ext:r" at the end. This will return all files that have the R extension. For instance:
If you wanted some high performance computing examples, this returns Russ Lenth's...
How to add NERDTree to your .vimrc
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If you're using a script like vimpager you should move these lines to your /.vim/after/plugin/NERD_tree.vim script, so that it doesn't try to execute with plugins turned off.
– Joshua Olson
Apr 23 '11 at ...
How do you commit code as a different user?
I want to be able to do this for a script. I'm essentially re-creating the entire version history of some code in Git - it currently uses a different version control system. I need the script to be able to add in the commits to Git while preserving the commit's original author (and date).
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Reference: Comparing PHP's print and echo
...in fact, it merely redirects to a dedicated SAPI function).
Speed: echo x vs print x
Unlike echo, print allocates a temporary variable. However, the amount of time spent on this activity is minuscule, so the difference between these two language constructs is negligible.
Speed: echo a,b,c vs ech...
How to insert element as a first child?
...</div>";
$("#parent-div").prepend(html);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="parent-div">
<div>Hello World</div>
</div>
<input type="button" value="add" class...
What does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
... source filenames. So "${BASH_SOURCE[0]}" would return you the name of the script file.
dirname is a utility provided by GNU coreutils that remove the last component from the filename. Thus if you execute your script by saying bash foo, "$( dirname "${BASH_SOURCE[0]}" )" would return .. If you said...
Why doesn't C++ have a garbage collector?
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community wiki
9 revs, 2 users 92%Brian R. Bondy
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