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List comprehension: Returning two (or more) items for each item
...gt; list(chain.from_iterable((f(x), g(x)) for x in range(3)))
[2, 0, 3, 1, 4, 4]
Timings:
from timeit import timeit
f = lambda x: x + 2
g = lambda x: x ** 2
def fg(x):
yield f(x)
yield g(x)
print timeit(stmt='list(chain.from_iterable((f(x), g(x)) for x in range(3)))',
setu...
Calculate difference in keys contained in two Python dictionaries
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234
You can use set operations on the keys:
diff = set(dictb.keys()) - set(dicta.keys())
Here is ...
How to calculate moving average using NumPy?
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14 Answers
14
Active
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Use a list of values to select rows from a pandas dataframe [duplicate]
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You can use isin method:
In [1]: df = pd.DataFrame({'A': [5,6,3,4], 'B': [1,2,3,5]})
In [2]: df
Out[2]:
A B
0 5 1
1 6 2
2 3 3
3 4 5
In [3]: df[df['A'].isin([3, 6])]
Out[3]:
A B
1 6 2
2 3 3
And to get the opposite use ~:
In [4]: df[~df['A'].isin([3, 6])]
Out[4]:
...
How to convert index of a pandas dataframe into a column?
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Brad Solomon
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answered Dec 9 '13 at 0:39
behzad.nouribehzad.n...
Syntax for creating a two-dimensional array
...ti[1] = new int[10];
multi[2] = new int[10];
multi[3] = new int[10];
multi[4] = new int[10];
Note that every element will be initialized to the default value for int, 0, so the above are also equivalent to:
int[][] multi = new int[][]{
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0, 0, 0, ...
Running a command in a Grunt Task
... with grunt-exec.
– Nathan
Mar 10 '14 at 18:44
3
Is there a way to use grunt-exec synchronously? ...
How do I check what version of Python is running my script?
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1423
This information is available in the sys.version string in the sys module:
>>> impor...
“Conversion to Dalvik format failed with error 1” on external JAR
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edited Feb 25 '14 at 11:00
community wiki
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Genymotion, “Unable to load VirtualBox engine.” on Mavericks. VBox is setup correctly
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144
I had the same problem and solved it by running the following command:
sudo /Library/StartupIt...