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What's the idiomatic syntax for prepending to a short python list?
...ue definitively not entirely Liskov substitutable for list.
>>> set(dir(list)) - set(dir(deque))
{'sort'}
The deque also has an appendleft method (as well as popleft). The deque is a double-ended queue and a doubly-linked list - no matter the length, it always takes the same amount of t...
Mercurial move changes to a new branch
... use the rebase extension. Suppose you have a history like this:
@ changeset: 2:81b92083cb1d
| tag: tip
| summary: my new feature: edit file a
|
o changeset: 1:8bdc4508ac7b
| summary: my new feature: add file b
|
o changeset: 0:d554afd54164
summary: initial
This...
Make Vim show ALL white spaces as a character
...
As others have said, you could use
:set list
which will, in combination with
:set listchars=...
display invisible characters.
Now, there isn't an explicit option which you can use to show whitespace, but in listchars, you could set a character to show for ...
【解决】如何查看 xunsearch 版本，验证是否升级成功？ - 更多技术 - 清泛...
...t: none)
E.g: tmp/xs-indexd.log, stderr
-q Set the queue size to commit, (default: 3000)
-e Set the external program path, (default: ./bin)
-k [fast] Server process running control
-v Show version information
-h Display this...
What is maximum query size for mysql?
...
You can check your current
server setting with:
SHOW VARIABLES LIKE 'max_allowed_packet';
This gives you the answer in bytes. for e.g max_allowed_packet=1048576 or 1mb
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How to clear variables in ipython?
...
%reset seems to clear defined variables.
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Why is volatile not considered useful in multithreaded C or C++ programming?
...icate whether or not some data is ready to be read. In our code, we simply set the flag after preparing the data, so all looks fine. But what if the instructions are reordered so the flag is set first?
volatile does guarantee the first point. It also guarantees that no reordering occurs between di...
What is a Portable Class Library?
...uart Lodge. Only minor tweaking as described by Stuart here to environment setup is necessary to leverage PCLs for such purposes.
UPDATE Apr 19 2013: Excellent dense summary of how it all hangs together from Intellisense through to run time in a blog post by Simon Cooper
Video: Channel 9 Visual...
Reorder levels of a factor without changing order of values
... I have a very strange situation where the ´reorder´ works on one dataset, not on another. On the other dataset, it throws an error "Error in tapply(X = X, INDEX = x, FUN = FUN, ...) : argument "X" is missing, with no default". Not sure what the solution to this problem is. I can't find any rel...
How do I use spaces in the Command Prompt?
...th column, e.g. PROGRA~1 or DEFAUL~1.XML, in your commands. For instance:
set JAVA_HOME=c:\PROGRA~1\Java\jdk1.6.0_45
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