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How to safely open/close files in python 2.4
...python.org:
When you’re done with a file, call f.close() to close it and free up any system resources taken up by the open file. After calling f.close(), attempts to use the file object will automatically fail.
Hence use close() elegantly with try/finally:
f = open('file.txt', 'r')
try:
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Difference between SurfaceView and View?
... if you need to update GUI rapidly or if the rendering takes too much time and affects user experience then use SurfaceView.
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Easier way to create circle div than using an image?
...lt;div class="circleBase type3"></div>
To make this work in IE8 and older, you must download and use CSS3 PIE. My demo above won't work in IE8, but that's only because jsFiddle doesn't host PIE.htc.
My demo looks like this:
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super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inh
...t declared as a "new-style" class. Change it like so:
class B(object):
and it will work.
super() and all subclass/superclass stuff only works with new-style classes. I recommend you get in the habit of always typing that (object) on any class definition to make sure it is a new-style class.
O...
Extracting numbers from vectors of strings
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How about
# pattern is by finding a set of numbers in the start and capturing them
as.numeric(gsub("([0-9]+).*$", "\\1", years))
or
# pattern is to just remove _years_old
as.numeric(gsub(" years old", "", years))
or
# split by space, get the element in first index
as.numeric(sapply(...
How do you get the magnitude of a vector in Numpy?
...order norm you want. Say you wanted the 1-norm:
np.linalg.norm(x,ord=1)
And so on.
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Adding Python Path on Windows 7
I've been trying to add the Python path to the command line on Windows 7, yet no matter the method I try, nothing seems to work. I've used the set command, I've tried adding it through the Edit Environment variables prompt etc.
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C/C++ line number
... of debugging purposes, can I get the line number in C /C++ compilers?
(standard way or specific ways for certain compilers)
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Colorized grep — viewing the entire file with highlighted matches
...y, "pattern|$" will match lines that have the pattern you're searching for AND lines that have an end -- that is, all of them. Because the end of a line isn't actually any characters, the colorized portion of the output will just be your pattern. Thanks Ryan!
– zslayton
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How can I assign the output of a function to a variable using bash?
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That's not 100% right. Command substitution always strips trailing newlines.
– TheBonsai
Nov 28 '09 at 17:36
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