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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...各大物联网平台的 8883 端口）没有问题。
连接超时固定 30 秒、心跳 60 秒。
以下高级用法内置组件没有，需要导入下面的 UrsPahoMqttClient 拓展（本页标注了（仅拓展）的部分）：
自签名证书、客户端证书双向认证、信任库 / ...
How to shift a column in Pandas DataFrame
...
In [18]: a
Out[18]:
x1 x2
0 0 5
1 1 6
2 2 7
3 3 8
4 4 9
In [19]: a.x2 = a.x2.shift(1)
In [20]: a
Out[20]:
x1 x2
0 0 NaN
1 1 5
2 2 6
3 3 7
4 4 8
...
Add EBS to Ubuntu EC2 Instance
... (with update to /etc/fstab so it stays mounted on reboot):
sudo mkdir -m 000 /vol
echo "/dev/xvdf /vol auto noatime 0 0" | sudo tee -a /etc/fstab
sudo mount /vol
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...
How to compare two dates?
...
505
Use the datetime method and the operator < and its kin.
>>> from datetime import d...
git update-index --assume-unchanged on directory
...roblematic. If you have those, you can use this:
git ls-files -z | xargs -0 git update-index --assume-unchanged
Edit: incorporated input from @MatthewScharley regarding git ls-files -z.
Windows Commands
Note: If you're on windows, use Git Bash to run these commands
...
Change how fast “title” attribute's tooltip appears
...
80
No, there's no way. The title attribute is implemented in a browser dependent fashion. For examp...
Newline in markdown table?
... |
edited Jan 13 '15 at 20:41
answered Aug 25 '12 at 5:03
...
Easy way to concatenate two byte arrays
...ghtforward:
byte[] c = new byte[a.length + b.length];
System.arraycopy(a, 0, c, 0, a.length);
System.arraycopy(b, 0, c, a.length, b.length);
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f...
Example of multipart/form-data
...ng a similar, but more in-depth answer at: https://stackoverflow.com/a/28380690/895245
To see exactly what is happening, use nc -l or an ECHO server and an user agent like a browser or cURL.
Save the form to an .html file:
<form action="http://localhost:8000" method="post" enctype="multipart/f...
Argparse: Required argument 'y' if 'x' is present
...
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edited Mar 20 '19 at 10:13
answered Oct 16 '13 at 22:11
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