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Sorting multiple keys with Unix sort
...
Here is one to sort various columns in a csv file by numeric and dictionary order, columns 5 and after as dictionary order
~/test>sort -t, -k1,1n -k2,2n -k3,3d -k4,4n -k5d sort.csv
1,10,b,22,Ga
2,2,b,20,F
2,2,b,22,Ga
2,2,c,19,Ga
2,2,c,19,Gb,hi
2,2,c,19,Gb,hj
2,...
App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...nventor 2 模拟sleep函数
【技巧】App Inventor 2 过滤蓝牙设备列表
【代码简洁之道】App Inventor 2 任何(Any)代码块
【技巧】代码块导出图像，以及还原
【技巧】块拓展：参数可变
【技巧】拷贝及分享功能
【技巧】App Inventor 2...
Pandas every nth row
...came up with when using the index was not viable ( possibly the multi-Gig .csv was too large, or I missed some technique that would allow me to reindex without crashing ).
Walk through one row at a time and add the nth row to a new dataframe.
import pandas as pd
from csv import DictReader
def make_...
记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...内存并不会释放，而是标记为非活跃，下次运行它时可以转换成活跃内存。但如果你不幸把可用内存用完了，Mac OS X并不会使用这些非活跃内存，而是直接使用虚拟内存（交换文件），这会严重影响运行效率。
如下命令可以查...
菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...fault
CMenu *Menu=GetMenu();
ClientToScreen(&point);//将窗口坐标转换成屏幕坐标
Menu->GetSubMenu(0)->TrackPopupMenu(
TPM_LEFTBUTTON|TPM_VERTICAL,point.x,point.y,this);
Menu->Detach();
CDialog::OnRButtonUp(nFlags, point);
}
要注意的是，要在界面显示的菜单...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识），连接蓝牙设备的代码如下：
蓝牙App控制硬件
开始控制...
How is mime type of an uploaded file determined by browser?
...70 (kPrimaryMappings and kSecondaryMappings).
An example: when uploading a CSV file from a Windows system with Microsoft Excel installed, Chrome will report this as application/vnd.ms-excel. This is because .csv is not specified in the first hard-coded list, so the browser falls back to the system r...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...lot2);
if (hslot->count < hslot2->count) //检查较短的那个hash链表
goto scan_primary_hash;
exist = udp_lib_lport_inuse2(net, snum, hslot2, //判断hash2是否有该端口正在被使用
sk, saddr_comp);
if (!exist && (hash2_nulladdr != slot2)) {
hslot2 = udp...
How to do what head, tail, more, less, sed do in Powershell? [closed]
... Holy cow, this is maxing out my CPU to do a -last 2 on a 1GB CSV. Hot beverage: ☕
– mlissner
Feb 19 '13 at 19:28
...
Lazy Method for Reading Big File in Python?
..., you can to use the file object itself as lazy generator:
with open('big.csv') as f:
for line in f:
process(line)
However, I once ran into a very very big (almost) single line file, where the row separator was in fact not '\n' but '|'.
Reading line by line was not an option, but I ...