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What is the purpose of “&&” in a shell command?
As far as I know, using & after the command is for running it in the background.
9 Answers
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How can I split a JavaScript string by white space or comma?
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input.split(/[ ,]+/);
This particular regex splits on a sequence of one or more commas or spaces, so that e.g. multiple consecutive spaces or a comma+space sequence do not produce empty elements in the results.
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How to dynamically compose an OR query filter in Django?
From an example you can see a multiple OR query filter:
13 Answers
13
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MFC 的SetWindowPos 用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...激活窗口
SWP_NOMOVE：保持当前位置（忽略x和y）
SWP_NOREDRAW：窗口不自动重画
SWP_NOSIZE：保持当前大小（忽略cx和cy）
SWP_NOZORDER：保持窗口在列表的当前位置（忽略hWndInsertAfter）
SWP_SHOWWINDOW：显示窗口
这些参数可...
Determine Whether Two Date Ranges Overlap
Given two date ranges, what is the simplest or most efficient way to determine whether the two date ranges overlap?
35 Answ...
How to use SVN, Branch? Tag? Trunk?
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The subversion book is an excellent source of information on strategies for laying out your repository, branching and tagging.
See also:
Do you continue development in a branch or in the trunk
Branching strategies
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How do I check if a string is unicode or ascii?
...bytes type that holds raw bytes.
In Python 2, a string may be of type str or of type unicode. You can tell which using code something like this:
def whatisthis(s):
if isinstance(s, str):
print "ordinary string"
elif isinstance(s, unicode):
print "unicode string"
else:
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How can I replace a newline (\n) using sed?
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Append the current and next line to the pattern space via N.
If we are before the last line, branch to the created label $!ba ($! means not to do it on the last line as there should be one final newline).
Finally the substitution replaces every newline with a space on the pattern space (which is th...
Is there shorthand for returning a default value if None in Python? [duplicate]
...if x is not null, and the empty string if x is null. I've found it useful for working with databases.
5 Answers
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If Python is interpreted, what are .pyc files?
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@froadie: a language is not "interpreted" or "compiled" as such. A specific implementation can be an interpreter or a compiler (or a hybrid or a JIT compiler).
– Joachim Sauer
Jun 8 '10 at 14:41
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