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Naming returned columns in Pandas aggregate function? [duplicate]
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107
This will drop the outermost level from the hierarchical column index:
df = data.groupby(...)....
Git Tag list, display commit sha1 hashes
...can run:
git show-ref --tags
The output will then look something like:
0e76920bea4381cfc676825f3143fdd5fcf8c21f refs/tags/1.0.0
5ce9639ead3a54bd1cc062963804e5bcfcfe1e83 refs/tags/1.1.0
591eceaf92f99f69ea402c4ca639605e60963ee6 refs/tags/1.2.0
40414f41d0fb89f7a0d2f17736a906943c05acc9 refs/tags/1.3...
Constructor overload in TypeScript
...tor overloading in TypeScript. On page 64 of the language specification (v 0.8), there are statements describing constructor overloads, but there wasn't any sample code given.
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How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?
...hould work:
SELECT CASE WHEN myfield~E'^\\d+$' THEN myfield::integer ELSE 0 END FROM mytable;
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Shell equality operators (=, ==, -eq)
... guaranteed to work.
$ a=foo
$ [ "$a" = foo ]; echo "$?" # POSIX sh
0
$ [ "$a" == foo ]; echo "$?" # bash specific
0
$ [ "$a" -eq foo ]; echo "$?" # wrong
-bash: [: foo: integer expression expected
2
(Side note: Quote those variable expansions! Do not leave out the double quotes ab...
How do I find out if first character of a string is a number?
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260
Character.isDigit(string.charAt(0))
Note that this will allow any Unicode digit, not just 0-9....
How to drop a list of rows from Pandas dataframe?
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401
Use DataFrame.drop and pass it a Series of index labels:
In [65]: df
Out[65]:
one two...
How to output only captured groups with sed?
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answered May 6 '10 at 2:39
Paused until further notice.Paused until further notice.
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How can I declare and define multiple variables in one line using C++?
... that if I declare these three variables that they will all have the value 0
10 Answers
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Using bitwise OR 0 to floor a number
...egers only
Odd Comparative behavior: Math.floor(NaN) === NaN, while (NaN | 0) === 0
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