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Recursively counting files in a Linux directory
...hat's not going to help, unless some implementation of wc has an option to read a null terminated list. See my answer for an alternative.
– Reinstate Monica Please
Mar 16 '15 at 1:34
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Storing Python dictionaries
...e third argument to pickle.dump, too. If the file doesn't need to be human-readable then it can speed things up a lot.
– Steve Jessop
Aug 18 '11 at 0:11
12
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Post Build exited with code 1
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My reason for the Code 1 was that the target folder was read only. Hope this helps someone!
I had a post build event to do a copy from one directory to another and the destination was read only. So I just went and unchecked the read-only attribute on the directory and all its sub...
JSON to pandas DataFrame
...th1+'&sensor=false')
response = urlopen(request)
elevations = response.read()
data = json.loads(elevations)
df = pd.json_normalize(data['results'])
This gives a nice flattened dataframe with the json data that I got from the Google Maps API.
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Language Books/Tutorials for popular languages
... in many cases, this means a real dead-tree book.
If you want to learn C, read K&R. If you want to learn C++, read Stroustrup. If you want to learn Lisp/Scheme, read SICP. Etc.
If you're not willing to spend more than $30 and a few hours to learn a language, you probably aren't going to lea...
When to encode space to plus (+) or %20?
...rt" it but what does that mean? It's either the server or client code that reads the query string and decodes it, not the browser. The browser simply passes it back and forth, and since the + is a reserved character it will be preserved by the browser.
– Dave Van den Eynde
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In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
In a Django form, how do I make a field read-only (or disabled)?
26 Answers
26
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How to call an external command?
...ocess.Popen("echo Hello World", shell=True, stdout=subprocess.PIPE).stdout.read()
instead of:
print os.popen("echo Hello World").read()
but it is nice to have all of the options there in one unified class instead of 4 different popen functions. See the documentation.
The call function from th...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
Why is it that scanf() needs the l in " %lf " when reading a double , when printf() can use " %f " regardless of whether its argument is a double or a float ?
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How to make a HTTP request using Ruby on Rails?
...don't reinvent the wheel, and you benefit from the hard work others have already done. If a gem exists that makes your life easier, there's generally no good reason not to use it.
– Marnen Laibow-Koser
Apr 10 '18 at 22:27
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