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Explaining Python's '__enter__' and '__exit__'

..._future__ import with_statement at the top of the file if you're on Python 2.5). with DatabaseConnection() as mydbconn: # do stuff PEP343 -- The 'with' statement' has a nice writeup as well. share | ...
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How to make graphics with transparent background in R using ggplot2?

I need to output ggplot2 graphics from R to PNG files with transparent background. Everything is ok with basic R graphics, but no transparency with ggplot2: ...
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Shorthand way for assigning a single field in a record, while copying the rest of the fields?

..., b :: Int, c :: String } -- define a Foo > let foo = Foo { a = 1, b = 2, c = "Hello" } -- create a Foo > let updateFoo x = x { c = "Goodbye" } -- function to update Foos > updateFoo foo -- update the Foo Foo {a = 1, b = 2, c = "G...
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How to wait until an element exists?

... | edited Jul 15 at 22:27 Khushraj Rathod 19722 silver badges1414 bronze badges answered May 24 '1...
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How to test chrome extensions?

... +250 Yes, the existing frameworks are pretty useful.. In the recent past, I have placed all my tests on a "test" page that was embedded ...
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Error in plot.new() : figure margins too large in R

...plots with smaller data sets. However, when I try to plot a large dataset (2gb+), I can produce the plot just fine, but the legend doesn't show up. Any advice? or alternatives? ...
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ignoring any 'bin' directory on a git project

... Before version 1.8.2, ** didn't have any special meaning in the .gitignore. As of 1.8.2 git supports ** to mean zero or more sub-directories (see release notes). The way to ignore all directories called bin anywhere below the current level in ...
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Vim: How to insert in visual block mode?

... 210 Try this After selecting a block of text, press Shift+i or capital I. Lowercase i will not wor...
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Difference between float and double in php?

...| edited Dec 11 '14 at 16:27 ratchet freak 43.8k55 gold badges5252 silver badges9999 bronze badges answe...