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Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
...eans that an assignment or function call up above failed or returned an unexpected result.
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How do I determine which iOS SDK I have?
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If you type this:
$> xcodebuild -showsdks
it gives something like this:
$> OS X SDKs:
OS X 10.8 -sdk macosx10.8
OS X 10.9 -sdk macosx10.9
iOS SDKs:
iOS 6.1 -sd...
PHP: How to send HTTP response code?
...ponses with HTTP response codes (status-codes), like HTTP 200 OK, or some 4XX or 5XX code.
9 Answers
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How to tell bash that the line continues on the next line
In a bash script I got from another programmer, some lines exceeded 80 columns in length. What is the character or thing to be added to the line in order to indicate that the line continues on the next line?
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How to add custom validation to an AngularJS form?
...the required attributes and such. But for some fields I need to do some extra validation. How would I "tap in" to the validation that FormController controls?
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Why would a JavaScript variable start with a dollar sign? [duplicate]
...variables that start with a dollar sign. When/why would you choose to prefix a variable in this way?
16 Answers
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Getting a list of all subdirectories in the current directory
...ach subdirectory. Ths first entry in the 3-tuple is a directory name, so
[x[0] for x in os.walk(directory)]
should give you all of the subdirectories, recursively.
Note that the second entry in the tuple is the list of child directories of the entry in the first position, so you could use this i...
Why does 2 mod 4 = 2?
...ign % is often used for the modulo operator, in lieu of the word mod.
For x % 4, you get the following table (for 1-10)
x x%4
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1 1
2 2
3 3
4 0
5 1
6 2
7 3
8 0
9 1
10 2
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How to get a random value from dictionary in python
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That will work in Python 2.x where d.keys() is a list, but it won't work in Python 3.x where d.keys() is an iterator. You should do random.choice(list(d.keys())) instead.
– Duncan
Feb 1 '11 at 9:42
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Clang vs GCC - which produces faster binaries? [closed]
...parison is appended to that.
I maintain an OSS tool that is built for Linux with both GCC and Clang,
and with Microsoft's compiler for Windows. The tool, coan, is a preprocessor
and analyser of C/C++ source files and codelines of such: its
computational profile majors on recursive-descent parsing...