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how to use “AND”, “OR” for RewriteCond on Apache?
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Homebrew: List only installed top level formulas
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How to check if a column exists in Pandas
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Python string.join(list) on object array rather than string array
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answered Jan 31 '09 at 0:10
Adam RosenfieldAdam Rosenfield
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Changing case in Vim
...se, or use gu<motion> for lowercase.
For more of these, see Section 3 in Vim's change.txt help file.
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How to get rid of the 'undeclared selector' warning
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edited Aug 21 '13 at 14:29
answered May 8 '12 at 23:50
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How do you see the entire command history in interactive Python?
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– macetw
Sep 23 at 16:45
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Efficient way to remove keys with empty strings from a dict
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dict((k, v) for k, v in metadata.iteritems() if v)
Python 2.7 - 3.X
{k: v for k, v in metadata.items() if v is not None}
Note that all of your keys have values. It's just that some of those values are the empty string. There's no such thing as a key in a dict without a value; if it d...
add a string prefix to each value in a string column using Pandas
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df['col'] = 'str' + df['col'].astype(str)
Example:
>>> df = pd.DataFrame({'col':['a...