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Which is faster: while(1) or while(2)?
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}
Even with no optimizations (-O0), the generated assembly was identical for both programs. Therefore, there is no speed difference between the two loops.
For reference, here is the generated assembly (using gcc main.c -S -masm=intel with an optimization flag):
With -O0:
.file "main.c"
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Change SVN repository URL
... repository probably won't change.
Note: svn relocate is not available before version 1.7 (thanks to ColinM for the info). In older versions you would use:
svn switch --relocate OLD NEW
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Error to install Nokogiri on OSX 10.9 Maverick?
I upgraded my OSX (Lion) to Mavericks and I can't install Nokogiri for my projects.
30 Answers
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Stripping everything but alphanumeric chars from a string in Python
... fastest.
$ python -m timeit -s \
"import string" \
"''.join(ch for ch in string.printable if ch.isalnum())"
10000 loops, best of 3: 57.6 usec per loop
$ python -m timeit -s \
"import string" \
"filter(str.isalnum, string.printable)"
10000 loops, best of 3: 37.9...
Zero-pad digits in string
...n a string. The following code does that:
$s = sprintf('%02d', $digit);
For more information, refer to the documentation of sprintf.
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How to write to a file, using the logging Python module?
...ame,
filemode='a',
format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
datefmt='%H:%M:%S',
level=logging.DEBUG)
logging.info("Running Urban Planning")
self.logger = loggin...
Two way/reverse map [duplicate]
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@SudhirJonathan: You can go much further with this idea--for instance, add an .add method so that you can do things like d.add('Bob', 'Alice') instead of using the syntax I showed. I would also include some error handling. But you get the basic idea. :)
– Sash...
How can I use PowerShell with the Visual Studio Command Prompt?
I've been using Beta 2 for a while now and it's been driving me nuts that I have to punt to cmd.exe when running the VS2010 Command Prompt. I used to have a nice vsvars2008.ps1 script for Visual Studio 2008. Anyone have a vsvars2010.ps1 or something similar?
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Allowed characters in Linux environment variable names
...iable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed.
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how to return index of a sorted list? [duplicate]
...ist and then return a list with the index of the sorted items in the list. For example, if the list I want to sort is [2,3,1,4,5] , I need [2,0,1,3,4] to be returned.
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