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AppInventor实现图片和文字等进行发帖和查看帖子功能 - App应用开发 - 清泛...
...其他用户可以进行浏览和收藏，这种可以实现吗？需要用API吗？
A：这里提供一些思路，欢迎补充。
1、最简便，使用Web开发，有现成开源方案，AppInventor用一个Web浏览器组件浏览即可，这时最直观简便的方式。
2、AppInventor原...
大模型拓展接入 kimi 报错？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...:"rate_li mit_reached_error"}}
报错显示调用太频繁被 api 方拒绝，每秒调用不能超过三次。不是 appinventor 和拓展的限制，是大模型 api 内部的限制。
python dataframe pandas drop column using int
... columns with identical names, the solutions given here so far will remove all of the columns, which may not be what one is looking for. This may be the case if one is trying to remove duplicate columns except one instance. The example below clarifies this situation:
# make a df with duplicate col...
Python __str__ and lists
In Java, if I call List.toString(), it will automatically call the toString() method on each object inside the List. For example, if my list contains objects o1, o2, and o3, list.toString() would look something like this:
...
How to convert an enum type variable to a string?
...
There really is no beautiful way of doing this. Just set up an array of strings indexed by the enum.
If you do a lot of output, you can define an operator<< that takes an enum parameter and does the lookup for you.
...
Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip)
...it in a "util" class. I had to modify it slightly to work with the current API.
For reference here's the working code (take it at your own risk...):
public static<A, B, C> Stream<C> zip(Stream<? extends A> a,
Stream<? extends B> b,
...
Redirecting stdout to “nothing” in python
...
A nice way to do this is to create a small context processor that you wrap your prints in. You then just use is in a with-statement to silence all output.
Python 2:
import os
import sys
from contextlib import contextmanager
@contextmanager
def silence_stdout():
...
SPAN vs DIV (inline-block)
...turn and have default margin.
Note that inline-block is not supported in all browsers. For instance in Firefox 2 and less you must use:
display: -moz-inline-stack;
which displays slightly different than an inline block element in FF3.
There is a great article here on creating cross browser inl...
String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
urlencode vs rawurlencode?
...php.net/manual/en/function.rawurlencode.php)
Returns a string in which all non-alphanumeric characters except -_.~ have been replaced with a percent (%) sign followed by two hex digits. This is the encoding described in » RFC 3986 for protecting literal characters from being interpreted as spec...