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ESP8285接入App Inventor 2深度调研：4种连接方案+是否需要开发拓展 - 创客...
...USB串口通信。但目前没有专门的IoT/ESP拓展组件。
三、4种连接方案详细分析
方案1：HTTP API方式(推荐首选)
原理：ESP8285上运行HTTP Server，App Inventor用内置Web组件调用。
ESP8285端代码(Arduino)：
#include <ESP8266WiFi.h>
#inclu...
Android: checkbox listener
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edited May 13 '14 at 16:43
primax79
42822 silver badges1414 bronze badges
answered Dec 5 '11 a...
C++ mark as deprecated
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194
In C++14, you can mark a function as deprecated using the [[deprecated]] attribute (see section ...
Practical example where Tuple can be used in .Net 4.0?
I have seen the Tuple introduced in .Net 4 but I am not able to imagine where it can be used. We can always make a Custom class or Struct.
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Normalize data in pandas
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In [92]: df
Out[92]:
a b c d
A -0.488816 0.863769 4.325608 -4.721202
B -11.937097 2.993993 -12.916784 -1.086236
C -5.569493 4.672679 -2.168464 -9.315900
D 8.892368 0.932785 4.535396 0.598124
In [93]: df_norm = (df - df.mean()) / (df.max() - df.m...
C# member variable initialization; best practice?
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answered Nov 18 '08 at 9:04
Marc Gravell♦Marc Gravell
888k227227 gold badges23562356 silver badges27202720 bronze badges
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Can an interface extend multiple interfaces in Java?
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174
Yes, you can do it. An interface can extend multiple interfaces, as shown here:
interface Maini...
Android 4.3 menu item showAsAction=“always” ignored
I'm using the new v7 appcompat library available starting from Android 4.3 (API level 18).
12 Answers
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Are tuples more efficient than lists in Python?
...much faster than assigning a list.
>>> def a():
... x=[1,2,3,4,5]
... y=x[2]
...
>>> def b():
... x=(1,2,3,4,5)
... y=x[2]
...
>>> import dis
>>> dis.dis(a)
2 0 LOAD_CONST 1 (1)
3 LOAD_CONST 2 ...
pyplot scatter plot marker size
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435
This can be a somewhat confusing way of defining the size but you are basically specifying the...