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MIT已发布v2.75版本，中文网已同步升级最新版本 - App Inventor 2 中文网 -...
大概的更新有：
1、添加一个绝对位置的布局。
2、ListView 组件升级，大图片+描述模式，支持左右滑动。
3、地图可自定义url，支持其他厂商地图，待探索测试国内地图看是否支持。
4、修复表格布局的复制粘贴bug，这个比较...
App Inventor 2 使用 MaterialIcons 图标字体，快捷展示专业图标 · App Inventor 2 中文网
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平时布局的话，如果要使用图标，一般需要去找 png 图片，且透明背景的。如果需要根据不同常见图标进行变色的话，就需要准备多张不同样式的图标，还要考虑图片的分辨率等等...
Get name of current class?
...:
__metaclass__ = InputAssigningMetaclass
class foo(MyBaseFoo):
# etc, no need to create 'input'
class foo2(MyBaseFoo):
# etc, no need to create 'input'
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Is arr.__len__() the preferred way to get the length of an array in Python?
...ents could still be length-checked. This includes strings, queues, trees, etc.
The functional nature of len() also lends itself well to functional styles of programming.
lengths = map(len, list_of_containers)
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Programmatically find the number of cores on a machine
...umCPU = sysconf(_SC_NPROCESSORS_ONLN);
FreeBSD, MacOS X, NetBSD, OpenBSD, etc.
int mib[4];
int numCPU;
std::size_t len = sizeof(numCPU);
/* set the mib for hw.ncpu */
mib[0] = CTL_HW;
mib[1] = HW_AVAILCPU; // alternatively, try HW_NCPU;
/* get the number of CPUs from the system */
sysctl(mib, ...
What does the “yield” keyword do?
...ill have looked
# at all the children of the children of the children, etc. of the candidate
candidates.extend(node._get_child_candidates(distance, min_dist, max_dist))
return result
This code contains several smart parts:
The loop iterates on a list, but the list expands while the loop...
What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
...les for when you can omit (omit) parentheses, dots, braces, = (functions), etc.?
6 Answers
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How to paste yanked text into the Vim command line
...een deleted goes to register 1, what was in register 1 goes to register 2, etc.),
" (default register, also known as unnamed register. This is where the " comes in Ctrl-R, "),
a to z for your own use (capitalized A to Z are for appending to corresponding registers).
_ (acts like /dev/null (Unix) or ...
App Inventor 2 项目合并工具 AIMerge · App Inventor 2 中文网
...gning the first screen to appear on the app should populate “Screen1.” All other developers should leave “Screen1” blank and only develop additional screens. In the case that another developer does populate “Screen1”, the merger tool will allow that screen to be renamed so it can be merg...
Chrome hangs after certain amount of data transfered - waiting for available socket
... subdomain called sounds.yoursite.com and load all your MP3s from there... etc..
Nginx has great options for directly serving static files and managing the static files caching.
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