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App Inventor 2 试验组件 · App Inventor 2 中文网
...)，编译为apk则不受限制安装后可正常运行。
demo程序下载：
chatgpt.aia
属性
ApiKey
ChatGPT 的 ApiKey，由用户提供。如果提供，我们将使用它来代替聊天代理服务中的 API 密钥。
注意：我们不将其作为属性在“界面设计”...
MyISAM versus InnoDB [closed]
...d operations can cause the data to become corrupt. This would require full repair or rebuilds of the indexes and tables.
InnoDB, on the other hand, uses a transactional log, a double-write buffer and automatic checksumming and validation to prevent corruption. Before InnoDB makes any changes, it re...
Why does modern Perl avoid UTF-8 by default?
...lts: you can have a working program for a long time, but when you start to repair it, it breaks. Don't worry; if you are adding encode/decode statements to your program and it breaks, it just means you have more work to do. Next time, when you design with Unicode in mind from the beginning, it will ...
How to use range-based for() loop with std::map?
...f you don't plan on modifying the values.
In C++11 and C++14, you can use enhanced for loops to extract out each pair on its own, then manually extract the keys and values:
for (const auto& kv : myMap) {
std::cout << kv.first << " has value " << kv.second << std::en...
How to iterate over rows in a DataFrame in Pandas
...roduce you to Pandas and its library of vectorized*/cythonized functions.
Enhancing Performance - A primer from the documentation on enhancing standard Pandas operations
Are for-loops in pandas really bad? When should I care? - a detailed writeup by me on list comprehensions and their suitability ...
ruby on rails f.select options with custom attributes
...
I ran into this issue as well and created the "enhanced_select" Ruby Gem to solve this problem. You can find it here:
https://github.com/bkuhlmann/enhanced_select
share
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Finding all cycles in a directed graph
...er the starting point of multiple practical algorithms which apply various enhancements in order to improve performance and avoid cycle duplication. I was surprised to find out some time ago that these algorithms are not readily available in textbooks and on the web. So I did some research and imple...
Will Try / Finally (without the Catch) bubble the exception?
... appropriate cleanup action if it's disrupted. Such actions might include repairing the data structure and returning True, throwing another "more severe" exception which wraps the original one, or letting the original exception percolate while returning False.
– supercat
...
Multiple aggregations of the same column using pandas GroupBy.agg()
...ive syntax for specifying named aggregations. See the 0.25 docs section on Enhancements as well as relevant GitHub issues GH18366 and GH26512.
From the documentation,
To support column-specific aggregation with control over the output
column names, pandas accepts the special syntax in GroupB...
How to delay the .keyup() handler until the user stops typing?
...
Another slight enhancement on CMS's answer. To easily allow for separate delays, you can use the following:
function makeDelay(ms) {
var timer = 0;
return function(callback){
clearTimeout (timer);
timer = setTimeout...