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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...
PHP append one array to another (not array_push or +)
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436
array_merge is the elegant way:
$a = array('a', 'b');
$b = array('c', 'd');
$merge = array_me...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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What Process is using all of my disk IO
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edited Dec 7 '14 at 14:13
Aaron Digulla
288k9494 gold badges528528 silver badges757757 bronze badges
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Insert an element at a specific index in a list and return the updated list
... do b = a[:index] + [obj] + a[index:].
However, another way is:
a = [1, 2, 4]
b = a[:]
b.insert(2, 3)
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Best data type for storing currency values in a MySQL database
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Something like Decimal(19,4) usually works pretty well in most cases. You can adjust the scale and precision to fit the needs of the numbers you need to store. Even in SQL Server, I tend not to use "money" as it's non-standard.
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Difference between numpy.array shape (R, 1) and (R,)
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554
1. The meaning of shapes in NumPy
You write, "I know literally it's list of numbers and list of...
How can I remove all text after a character in bash?
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edited Jun 10 '18 at 5:04
XtraSimplicity
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What is a message pump?
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answered Feb 8 '10 at 16:54
Hans PassantHans Passant
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