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Pandas read_csv low_memory and dtype options
...ain use is for indexing. See more here
'Int8', 'Int16', 'Int32', 'Int64', 'UInt8', 'UInt16', 'UInt32', 'UInt64' are all pandas specific integers that are nullable, unlike the numpy variant.
'string' is a specific dtype for working with string data and gives access to the .str attribute on the series...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
... 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
uint8_t reverse(uint8_t n) {
// Reverse the top and bottom nibble then swap them.
return (lookup[n&0b1111] << 4) | lookup[n>>4];
}
// Detailed breakdown of the math
// + lookup reverse of bottom nibble...
How can I programmatically generate keypress events in C#?
..."user32.dll")]
public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);
sample code is given below:
const int VK_UP = 0x26; //up key
const int VK_DOWN = 0x28; //down key
const int VK_LEFT = 0x25;
const int VK_RIGHT = 0x27;
const uint KEYEVENTF_KEYUP = 0x0002;
...
How to check file MIME type with javascript before upload?
... = new FileReader();
fileReader.onloadend = function(e) {
var arr = (new Uint8Array(e.target.result)).subarray(0, 4);
var header = "";
for(var i = 0; i < arr.length; i++) {
header += arr[i].toString(16);
}
console.log(header);
// Check the file signature against known types
};
...
MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...info.pt = point;
lvinfo.flags = LVHT_ABOVE;
UINT nFlag;
int nItem = m_list.HitTest(point, &nFlag);
//判断是否点在checkbox上
if(nFlag == LVHT_ONITEMSTATEICON)
{
AfxMessageBox("点在listctrl的check...
What is the difference between a weak reference and an unowned reference?
...(name: String) { self.name = name }
}
class CreditCard {
let number: UInt64
unowned let customer: Customer
init(number: UInt64, customer: Customer) { self.number = number; self.customer = customer }
}
In this example, a Customer may or may not have a CreditCard, but a CreditCard will ...
Most common C# bitwise operations on enums
...umerable.Range(0, 64)
.Where(bit => ((flags.GetTypeCode() == TypeCode.UInt64 ? (long)(ulong)flags : Convert.ToInt64(flags)) & (1L << bit)) != 0)
.Select(bit => Enum.ToObject(flags.GetType(), 1L << bit))`
Enums.NET flags.GetFlags()
I'm trying to get these improvements i...
What encoding/code page is cmd.exe using?
...<stdio.h>
#include <windows.h>
int main() {
int c, n;
UINT oldCodePage;
char buf[1024];
oldCodePage = GetConsoleOutputCP();
if (!SetConsoleOutputCP(65001)) {
printf("error\n");
}
freopen("uc-test-UTF-8-nobom.txt", "rb", stdin);
n = fread(buf, si...
MFC中通过Tooltip类实现悬浮鼠标显示提示信息 - C/C++ - 清泛网 - 专注C/C++及内核技术
...一个函数用于动态提供显示内容，其原型为 BOOL SetTipText(UINT id, NMHDR *pTTTStruct, LRESULT *pResult)，下面的代码可以根据传入的参数判定应该显示的内容。
BOOL CWndYour::SetTipText(UINT id, NMHDR *pTTTStruct, LRESULT *pResult)
{
TOOLTIPTEXT *pTT...
How do I shutdown, restart, or log off Windows via a bat file?
...ctual function signature for ExitWindowsEx is:
BOOL WINAPI ExitWindowsEx(UINT uFlags, DWORD dwReserved);
in 2011: "Throwing garbage on the sidewalk: The sad history of the rundll32 program"
And to make it crystal-clear:
in 2013 "What's the guidance on when to use rundll32? Easy: Don't use i...