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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
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函数
属性
应用场景
1. 数据记录应用
2. MQTT 客户端
3. 食谱显示应用
4. 长时间运行的应用
5. 下载管理器
重要说明
权限要求
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手机串口调试助手：USB OTG 收发文本与十六进制、定时发送（附 .aia 源码）...
...TG 的安卓手机、OTG 转接头、USB 转 TTL 串口模块（CH340 / CP2102 / FT232 / PL2303 均可），或者直接接 Arduino 开发板的 USB 口。
打开串口：选波特率（与设备一致，Arduino 常用 9600 或 115200），点「打开串口」。第一次会弹出 USB 授权框...
Catching error codes in a shell pipe
...e simple version of that is:
tmp=${TMPDIR:-/tmp}/mine.$$
if ./a > $tmp.1
then
if ./b <$tmp.1 >$tmp.2
then
if ./c <$tmp.2
then : OK
else echo "./c failed" 1>&2
fi
else echo "./b failed" 1>&2
fi
else echo "./a failed" 1>&...
Drop all duplicate rows across multiple columns in Python Pandas
...t pandas as pd
df = pd.DataFrame({"A":["foo", "foo", "foo", "bar"], "B":[0,1,1,1], "C":["A","A","B","A"]})
df.drop_duplicates(subset=['A', 'C'], keep=False)
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Extracting the last n characters from a ruby string
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101
Here you have a one liner, you can put a number greater than the size of the string:
"123".sp...
Add column with constant value to pandas dataframe [duplicate]
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21
The reason this puts NaN into a column is because df.index and the Index of your right-hand-side...
扫码寻宝 · App Inventor 2 中文网
...下一条线索，退出重进还能接着玩。主要用到条码扫描器1、微数据库和两个并排的列表。
★★ 难度
动手完成
项目教程跟着步骤完成...
How to install the current version of Go in Ubuntu Precise
Running sudo apt-get install golang-stable , I get Go version go1.0.3 . Is there any way to install go1.1.1 ?
16 Answers...
How to disassemble one single function using objdump?
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answered Apr 1 '14 at 1:47
Tom TromeyTom Tromey
18.1k3535 silver badges5454 bronze badges
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