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Extract first item of each sublist
...t numpy-way, transforming the array:
%timeit list(np.array(lst).T[0])
4.9 µs ± 163 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
Fully native using list comprehension (as explained by @alecxe):
%timeit [item[0] for item in lst]
379 ns ± 23.1 ns per loop (mean ± std. dev. of 7 ...
Port 80 is being used by SYSTEM (PID 4), what is that?
...
the IP adress is 0.0.0.0, state = LISTENING: means that port 80 is listening to all interfaces (not used)
How to read NETSTAT -AN results:
https://sites.google.com/site/xiangyangsite/home/technical-tips/linux-unix/networks-rel...
App Inventor 2 物联网入门的两个方向：BLE直连硬件 vs MQTT云端通信，你的...
...单房间、近距离控制 → BLE 更简洁稳定。
场景2：远程监控与数据采集
假设你做了一个温湿度监测仪，放在老家阳台，想在上海出差时查看数据。
BLE方案：手机和模块距离超出10米就断开连接，方案根本不成立。
MQTT方...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...入特征数据值。 例如，通过电池电量服务和特性，可以监控所连接设备的电池电量。 由于 GATT 服务和特性的通用性，这种方法可以与大量 BLE 设备兼容。
测试
蓝牙 LE 组件开发完成后，下一步涉及组件测试。 ...
UnicodeDecodeError when redirecting to file
...n when redirected to a file.
#coding: utf8
import sys
uni = u'αßΓπΣσµτΦΘΩδ∞φ'
print >>sys.stderr,sys.stdout.encoding
print uni
Output (run directly from terminal)
cp437
αßΓπΣσµτΦΘΩδ∞φ
Python correctly determined the encoding of the terminal.
Output (redirec...
Pandas - Get first row value of a given column
...ter than using .iloc:
In [1]: %timeit -n 1000 df['Btime'].values[20]
5.82 µs ± 142 ns per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [2]: %timeit -n 1000 df['Btime'].iloc[20]
29.2 µs ± 1.28 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
...
How to add a button to UINavigationBar?
...red Mar 23 '10 at 23:45
Mads MobækMads Mobæk
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Pandas conditional creation of a series/dataframe column
...map( lambda x: 'red' if x == 'Z' else 'green')
1000 loops, best of 3: 239 µs per loop
1000 loops, best of 3: 523 µs per loop
1000 loops, best of 3: 263 µs per loop
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Getting a map() to return a list in Python 3.x
...imeit -r5 ordinals = list(range(45))
... list(map(chr, ordinals))
...
3.91 µs ± 60.2 ns per loop (mean ± std. dev. of 5 runs, 100000 loops each)
>>> %%timeit -r5 ordinals = list(range(45))
... [*map(chr, ordinals)]
...
3.84 µs ± 219 ns per loop (mean ± std. dev. of 5 runs, 100000 loo...
Can jQuery read/write cookies to a browser?
Simple example: I want to have some items on a page (like divs or table rows), and I want to let the user click on them to select them. That seems easy enough in jQuery. To save which items a user clicks on with no server-side post backs, I was thinking a cookie would be a simple way to get this don...