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Why does Python use 'magic methods'?
...g around with Python recently, and one thing I'm finding a bit odd is the extensive use of 'magic methods', e.g. to make its length available, an object implements a method, def __len__(self) , and then it is called when you write len(obj) .
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How to find out if a Python object is a string?
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Python 3
In Python 3.x basestring is not available anymore, as str is the sole string type (with the semantics of Python 2.x's unicode).
So the check in Python 3.x is just:
isinstance(obj_to_test, str)
This follows the fix of the official 2to...
Express.js req.body undefined
I have this as configuration of my Express server
35 Answers
35
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Default parameter for CancellationToken
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It turns out that the following works:
Task<x> DoStuff(...., CancellationToken ct = default(CancellationToken))
which, according to the documentation, is interpreted the same as CancellationToken.None:
You can also use the C# default(CancellationToken) stateme...
How to amend several commits in Git to change author
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mind explaining this a bit more? not sure what filter branch is
– max pleaner
Aug 23 '14 at 19:34
1
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clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
... error by setting the following environment variables prior compilation:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
Then pip install psycopg2should work.
I had the same when trying to pip install lxml.
Edit: if you are installing as superuser (which will likely be the c...
Matching a space in regex
I need to match a space character in a PHP regular expression. Anyone got any ideas?
9 Answers
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What does .SD stand for in data.table in R
... like "Subset of Data.table". There's no significance to the initial ".", except that it makes it even more unlikely that there will be a clash with a user-defined column name.
If this is your data.table:
DT = data.table(x=rep(c("a","b","c"),each=2), y=c(1,3), v=1:6)
setkey(DT, y)
DT
# x y v
# ...
Where is Java Installed on Mac OS X?
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Use /usr/libexec/java_home -v 1.8 command on a terminal shell to figure out where is your Java 1.8 home directory
If you just want to find out the home directory of your most recent version of Java, omit the version. e.g. /usr/libexec/ja...
Django Rest Framework File Upload
...Parser, it's all in the request.
Use a put method instead, you'll find an example in the docs :)
class FileUploadView(views.APIView):
parser_classes = (FileUploadParser,)
def put(self, request, filename, format=None):
file_obj = request.FILES['file']
# do some stuff with up...