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App Inventor 2 经典蓝牙(SPP) 硬件接入：hc05 · App Inventor 2 中文网
...之类的，也可能是连接相关的代码写的不对，用的错误的地址连接等。
一般来说多是使用 hc05 经典蓝牙连接出现的问题，配对后没通电开机，会报这个错误。配对后硬件发生变更比如配对码修改了等等，也会报这个错误。
当...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...语句提供了一种非常方便的处理方式。一个很好的例子是文件处理，你需要获取一个文件句柄，从文件中读取数据，然后关闭文件句柄。 Without the with statement, one would write something along the lines of: 如果不用with语句，代码如下：
f...
How do I run all Python unit tests in a directory?
I have a directory that contains my Python unit tests. Each unit test module is of the form test_*.py . I am attempting to make a file called all_test.py that will, you guessed it, run all files in the aforementioned test form and return the result. I have tried two methods so far; both have fail...
What are the mathematical/computational principles behind this game?
... This sounds awesome, but I have no certainty that it actually models the problem well. @ypercube, could you explain a bit more why you think the analogy between card/picture and point/line is valid?
– Nate Kohl
Jun 5 '11 at 4:03
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OpenSSH升级后不能登录的问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...后，使用客户端怎么都登录不上去
一开始以为是配置文件的问题，把另外一台没升级过的配置文件sshd_config拷贝到本机，不行
寄出百度 http://bbs.51cto.com/thread-1098820-1.html
按照这个说法
修改配置文件后，发现还是不行...
Multiple linear regression in Python
...
sklearn.linear_model.LinearRegression will do it:
from sklearn import linear_model
clf = linear_model.LinearRegression()
clf.fit([[getattr(t, 'x%d' % i) for i in range(1, 8)] for t in texts],
[t.y for t in texts])
Then clf.coef_ ...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...硬件还支持内部的控制指令（如设置连接密码、查询硬件地址、主模式连接其他蓝牙等）。注意：BRTS接GND才能执行控制指令，如图：AT开头是控制指令；非AT开头是透传数据：
这里仅演示了需求硬件状态、MAC地址的指令，当然...
How to render a DateTime in a specific format in ASP.NET MVC 3?
If I have in my model class a property of type DateTime how can I render it in a specific format - for example in the format which ToLongDateString() returns?
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2016年最适合小投资的10个创业项目 - 资讯 - 清泛网 - 专注C/C++及内核技术
...心设计的统一包装的精美套饰，以及当年当月当日出生的世界名人介绍等等，有的甚至可以卖上百元，而且这类店面没有淡旺季之分，每天都有人过生日，只要店面有足够吸引力就可以赢利。生日用品市场如此广阔，难怪一些外...
Why do people say there is modulo bias when using a random number generator?
...one here which will hopefully help people understand why exactly there is "modulo bias" when using a random number generator, like rand() in C++.
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