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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...
How to remove unused C/C++ symbols with GCC and ld?
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maxschlepzig
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answered Jul 21 '11 at 1:11
J TJ T
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How do you delete a column by name in data.table?
... copy of it), Methods 1, 2a, and 2b are really the best options.
# Method 4:
df3[, .SD, .SDcols = !patterns("^foo$")]
Lastly there are approaches using with=FALSE, though data.table is gradually moving away from using this argument so it's now discouraged where you can avoid it; showing here so...
Python: Tuples/dictionaries as keys, select, sort
Suppose I have quantities of fruits of different colors, e.g., 24 blue bananas, 12 green apples, 0 blue strawberries and so on.
I'd like to organize them in a data structure in Python that allows for easy selection and sorting. My idea was to put them into a dictionary with tuples as keys, e.g.,
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Unit Testing C Code [closed]
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504
One unit testing framework in C is Check; a list of unit testing frameworks in C can be found he...
Numpy `logical_or` for more than two arguments
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answered Dec 11 '13 at 19:48
abarnertabarnert
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Where can I find WcfTestClient.exe (part of Visual Studio)
...rror500 - Internal Server Error
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30
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Use of #pragma in C
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answered Oct 24 '08 at 8:03
Steven A. LoweSteven A. Lowe
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Convert a Python list with strings all to lowercase or uppercase
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461
It can be done with list comprehensions. These basically take the form of [function-of-item fo...