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Check for installed packages before running install.packages() [duplicate]
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edited Feb 18 '12 at 14:02
Sacha Epskamp
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Convert bytes to a string
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edited Jul 24 '15 at 18:14
answered Mar 3 '09 at 12:26
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How to test multiple variables against a value?
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25 Answers
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Hidden features of Windows batch files
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Convert timedelta to total seconds
...s().
>>> import datetime
>>> datetime.timedelta(seconds=24*60*60).total_seconds()
86400.0
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How to convert a column number (e.g. 127) into an Excel column (e.g. AA)
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How do I diff the same file between two different commits on the same branch?
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From the git-diff manpage:
git diff [--options] <commit> <commit> [--] [<path&g...
Why do we need the “finally” clause in Python?
...e if you return early:
try:
run_code1()
except TypeError:
run_code2()
return None # The finally block is run before the method returns
finally:
other_code()
Compare to this:
try:
run_code1()
except TypeError:
run_code2()
return None
other_code() # This doesn't ...
ruby convert array into function arguments
...expects two arguments. Is there a way to on the fly convert the array into 2 arguments?
For example:
2 Answers
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Are SVG parameters such as 'xmlns' and 'version' needed?
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All user agents (browsers) ignore the version attribute, so you can always drop that.
If you ...