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二维图表数据如何从文件导入？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
Q: 使用这个功能后，如何显示曲线呢？如何依次获取 x 值和 y 值？test.csv
time,data
1201,6
1202,6.2
1203,6.1
1204,6.5
1205,6.4从csv加载数据：
效果如下：
SpeechRecognizer 语音识别扩展：获取设备支持的语音识别语言列表 · App I...
... android.permission.INTERNET 权限。
下载
.aix拓展文件：
com.puravidaapps.TaifunSpeechRecognizer.aix
.aia示例文件：
speech.aia
版本历史
版本
日期
修改内容
1
2016-11-0...
GestureDetector 手势检测拓展：旋转、缩放和滑动手势检测，自定义手势识别...
...器、地图缩放、游戏控制等需要手势交互的场景。
.aix 拓展下载：
cn.fun123.GestureDetector.aix
基本用法
旋转/缩放（绑定到 Canvas）：
在设计器中拖入 Canvas 画布组件
拖入 RotationDetector 或 ScaleDetector 组件
...
Remove a prefix from a string [duplicate]
...
I don't know about "standard way".
def remove_prefix(text, prefix):
if text.startswith(prefix):
return text[len(prefix):]
return text # or whatever
As noted by @Boris and @Stefan, on Python 3.9+ you can use
text.removeprefix(prefix)
with the same behavio...
What is the fastest integer division supporting division by zero no matter what the result is?
...s I got rid of the branch on my Pentium and gcc compiler using
int f (int x, int y)
{
y += y == 0;
return x/y;
}
The compiler basically recognizes that it can use a condition flag of the test in the addition.
As per request the assembly:
.globl f
.type f, @function
f:
...
How do you validate a URL with a regular expression in Python?
... to parse (and validate) URL's is the urlparse (py2, py3) module.
A regex is too much work.
There's no "validate" method because almost anything is a valid URL. There are some punctuation rules for splitting it up. Absent any punctuation, you still have a valid URL.
Check the RFC carefully ...
Call Go functions from C
...nnecessary bits. It should make things a little clearer.
package foo
// extern int goCallbackHandler(int, int);
//
// static int doAdd(int a, int b) {
// return goCallbackHandler(a, b);
// }
import "C"
//export goCallbackHandler
func goCallbackHandler(a, b C.int) C.int {
return a + b
}
/...
Convert generator object to list for debugging [duplicate]
...ging in Python using IPython, I sometimes hit a break-point and I want to examine a variable that is currently a generator. The simplest way I can think of doing this is converting it to a list, but I'm not clear on what's an easy way of doing this in one line in ipdb , since I'm so new to Python.
...
兼容主流浏览器的JS复制内容到剪贴板 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...伙伴参考下。现在浏览器种类也越来越多，诸如 IE、Firefox、Chrome、Safari等等，因此现在要实现一个js复制内容到剪贴板的小功能就不是一件那么容易的事了。
在FLASH 9 时代，有一个通杀所有浏览器的js复制内容到剪贴板的方案：...
PHP “pretty print” json_encode [duplicate]
... that creates a JSON file. Right now I'm just using json_encode (PHP 5.2.x) to encode an array into JSON output. Then I print the returned value to a file and save it. Problem is that the client wants to be able to open these JSON files for readability, so I'd like to add line breaks in and "prett...