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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...
reformat in vim for a nice column layout
I have this dataset in a csv file
13 Answers
13
...
returning in the middle of a using block
...(var textwriter = new StreamWriter(memoryStream))
{
using (var csv = new CsvWriter(textwriter))
{
//..write some stuff to the stream using the CsvWriter
return memoryStream.ToArray();
}
}
}
I was passing in a DataTable to be outputted as csv....
Combine Date and Time columns using python pandas
...ou may have been able to read this in directly e.g. if you were using read_csv using parse_dates=[['Date', 'Time']].
Assuming these are just strings you could simply add them together (with a space), allowing you to apply to_datetime:
In [11]: df['Date'] + ' ' + df['Time']
Out[11]:
0 01-06-2013...
Nullable Foreign Key bad practice?
...red Nov 12 '09 at 17:14
Patrik HägnePatrik Hägne
15k33 gold badges4848 silver badges5858 bronze badges
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What is Common Gateway Interface (CGI)?
...ed Jan 18 '10 at 21:23
Juha SyrjäläJuha Syrjälä
30k3030 gold badges121121 silver badges171171 bronze badges
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Sorting multiple keys with Unix sort
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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,...
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_...
How to compare times in Python?
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You might want to flip the acceptance to Pär Wieslander's answer (and generally should wait a few more minutes than you did :P), as it's a bit more specific to exactly what you asked.
– Roger Pate
Dec 2 '09 at 8:40
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Creating a new DOM element from an HTML string using built-in DOM methods or Prototype
I have an HTML string representing an element: '<li>text</li>' . I'd like to append it to an element in the DOM (a ul in my case). How can I do this with Prototype or with DOM methods?
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