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How to use filter, map, and reduce in Python 3
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@Breezer actually i**3 will call i.__pow__(3) and i*i*i i.__mul__(i).__mul__(i) (or something like that). With ints it doesn't matter but with numpy numbers/custom classes it might even produce different results.
– syntonym
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Do try/catch blocks hurt performance when exceptions are not thrown?
...TryCatch() cil managed
{
// Code size 32 (0x20)
.maxstack 8
IL_0000: nop
IL_0001: ldstr "SIN(1) = {0} - No Try/Catch"
IL_0006: ldc.r8 1.
IL_000f: call float64 [mscorlib]System.Math::Sin(float64)
IL_0014: box [mscorlib]System.Double
IL_0019: call ...
Is there a range class in C++11 for use with range based for loops?
...C++ standard library does not have one, but Boost.Range has boost::counting_range, which certainly qualifies. You could also use boost::irange, which is a bit more focused in scope.
C++20's range library will allow you to do this via view::iota(start, end).
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How to printf uint64_t? Fails with: “spurious trailing ‘%’ in format”
I wrote a very simple test code of printf uint64_t:
3 Answers
3
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What's the best way to inverse sort in scala?
...way of changing the sign, if you sort by some numeric value
list.sortBy(- _.size)
More generally, sorting may be done by method sorted with an implicit Ordering, which you may make explicit, and Ordering has a reverse (not the list reverse below)
You can do
list.sorted(theOrdering.reverse)
If...
import module from string variable
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The __import__ function can be a bit hard to understand.
If you change
i = __import__('matplotlib.text')
to
i = __import__('matplotlib.text', fromlist=[''])
then i will refer to matplotlib.text.
In Python 2.7 and Python ...
How update the _id of one MongoDB Document?
I want update an _id field of one document. I know it's not a really good pratice. But with some technical reason, I need update it. If I try to update it I get:
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C/C++获取Windows的CPU、内存、硬盘使用率 - C/C++ - 清泛网 - 专注C/C++及内核技术
...率1.获取Windows系统内存使用率 Win 内存 使用率 DWORD getWin_MemUsage(){MEMORYSTATUS ms;::GlobalMemoryStatus(&ms);return ms.d...1.获取Windows系统内存使用率
//Win 内存 使用率
DWORD getWin_MemUsage()
{
MEMORYSTATUS ms;
::GlobalMemoryStatus(&ms);
return ms.dwMe...
error: ‘uint16_t’ does not name a type - c++1y / stl - 清泛IT社区，为创新赋能！
... OTHER
* DEALINGS IN THE SOFTWARE.
*/
/* Created by Danny Smith <danny_r_smith_2001@yahoo.co.nz> */
#ifndef _STDINT_H
#define _STDINT_H
#pragma GCC system_header
#include <_mingw.h>
/* ISO C9x 7.18 Integer types <stdint.h>
* Based on ISO/IEC SC22/WG14 9899...
Get model's fields in Django
...o list all of its fields. I've seen some examples of doing this using the _meta model attribute, but doesn't the underscore in front of meta indicate that the _meta attribute is a private attribute and shouldn't be accessed directly? ... Because, for example, the layout of _meta could change in th...