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搜索不到ble设备 - App应用开发 - 清泛IT社区，为创新赋能！
使用AI伴侣能搜索到ble设备，但是安装apk后搜索不到,这是怎么回事呢大概率是权限问题，在手机设置将 app 相关权限都打开试试，尤其是发现设备等权限。
【原因】Al伴侣出现错误: invoke: no method named Theme' in class edu.mi...
... 其他任何途径中的AI伴侣版本过低导致的。
解决：升级到最新的AI伴侣即可。
升级可参考：https://www.fun123.cn/reference/creative/ai2_starter.html
【解决】Error 701: Unable to load xxx.xxx - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...上传的某资源，就会报这个错误。因为资源不会自动同步到AI伴侣，它必须在AI伴侣连接的时候才能同步过去，因此重新连接一次就好了。
【解决】ble蓝牙 RequestMTU 请求没有反应？设置没有生效？ - 创客硬件开发...
...eference/iot/bluetoothle.html#RequestMTU
看文档，它不一定能设置到你指定的值，是双方协商的结果，以事件回调中最终结果为准。
3、确认ble蓝牙版本：
文档要求 ble4.2 及以上才支持MTU设置，否则设置无效。
（可以问 AI 确定硬...
Add up a column of numbers at the Unix shell
...
python3 -c"import os; print(sum(os.path.getsize(f) for f in open('files.txt').read().split()))"
Or if you just want to sum the numbers, pipe into:
python3 -c"import sys; print(sum(int(x) for x in sys.stdin))"
...
How can strings be concatenated?
How to concatenate strings in python?
7 Answers
7
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Why use argparse rather than optparse?
I noticed that the Python 2.7 documentation includes yet another command-line parsing module. In addition to getopt and optparse we now have argparse .
...
what does the __file__ variable mean/do?
...
When a module is loaded from a file in Python, __file__ is set to its path. You can then use that with other functions to find the directory that the file is located in.
Taking your examples one at a time:
A = os.path.join(os.path.dirname(__file__), '..')
# A is...
How Pony (ORM) does its tricks?
...
Pony ORM author is here.
Pony translates Python generator into SQL query in three steps:
Decompiling of generator bytecode and rebuilding generator AST
(abstract syntax tree)
Translation of Python AST into "abstract SQL" -- universal
list-based representation of a...
Is there a difference between foo(void) and foo() in C++ or C?
...difference.
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf
Annex C "Compatibility" C.1.7 Clause 8: declarators says:
8.3.5 Change: In C ++ , a function declared with an empty parameter list takes no arguments. In C, an empty
parameter list means that the number and type of...