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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...Speed comparion (using Wouter's method)
In [6]: df = pd.DataFrame(randint(0,10,10000).reshape(5000,2),columns=list('AB'))
In [7]: %timeit dict(zip(df.A,df.B))
1000 loops, best of 3: 1.27 ms per loop
In [8]: %timeit pd.Series(df.A.values,index=df.B).to_dict()
1000 loops, best of 3: 987 us per loop...
SQL Server: Maximum character length of object names
...m character length of object name (e.g. constraint, column) in SQL Server 2008?
3 Answers
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Replace only text inside a div using jquery
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edited Oct 29 '14 at 20:50
cuSK
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answered Aug 8 '12 at 14:56
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Difference between `mod` and `rem` in Haskell
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20
I had the same question about rem and mod in Clojure, and this was the answer.
– noahlz
Jul 11 '12 at...
How to select only the first rows for each unique value of a column
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answered Jan 11 '11 at 20:50
gbngbn
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How do I check out a specific version of a submodule using 'git submodule'?
...ing the change to the parent repository.
$ cd submodule
$ git checkout v2.0
Previous HEAD position was 5c1277e... bumped version to 2.0.5
HEAD is now at f0a0036... version 2.0
git-status on the parent repository will now report a dirty tree:
# On branch dev [...]
#
# modified: submodule (n...
Is there a way to rename an Xcode 4 scheme?
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edited Mar 18 '11 at 0:59
answered Mar 18 '11 at 0:54
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Assigning a variable NaN in python without numpy
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170
Yes -- use math.nan.
>>> from math import nan
>>> print(nan)
nan
>>>...
fork() branches more than expected?
...llykwallyk
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12
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SQL query for today's date minus two months
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290
If you are using SQL Server try this:
SELECT * FROM MyTable
WHERE MyDate < DATEADD(month, -2...