大约有 44,300 项符合查询结果（耗时：0.0363秒） [XML]
Reshaping data.frame from wide to long format
...
|
edited Oct 21 '19 at 10:33
Jaap
68.6k2525 gold badges155155 silver badges164164 bronze badges
...
App Inventor 2 中文网已全面升级https安全通道，数据安全有保障！ - App I...
经过一段时间的努力，App Inventor 2 中文网（fun123.cn）已全部升级https安全通道，以保护用户的访问及数据安全，值得注意的是MIT官方目前仍是http非安全通道。
App Inventor 2 中文网（fun123.cn）安全通道
MIT官方目前非安全通道...
利用 App Inventor 2 开发ChatGPT应用 - App Inventor 2 中文网 - 清泛网 - 专注C/C++及内核技术
利用 App Inventor 2 开发ChatGPT应用app_inventor_2_chatgptChatGPT大家应该不会陌生，它的回答内容非常的专业及深入，具有实际的可指导性。我们通过App Inventor 2开发一个简单的对话App，先看效果：您的浏览器不支持 video 标签代码块 ChatG...
App Inventor 2 模拟sleep函数 · App Inventor 2 中文网
...反馈
App Inventor 2 模拟sleep函数
App Inventor 2 模拟sleep函数
需要用到计时器组件：
实现代码如下：
测试方法如下：
代码快速导入技...
App Inventor 2 接入阿里云短信服务，实现短信验证码功能 · App Inventor 2 中文网
...反馈
App Inventor 2 接入阿里云短信服务，实现短信验证码功能
App Inventor 2 中文网原创开发阿里短信平台接入拓展
短信发送代码参考：
发送...
The tilde operator in Python
...
204
It is a unary operator (taking a single argument) that is borrowed from C, where all data type...
Is it possible to have multiple statements in a python lambda expression?
...found in the heapq module.
>>> import heapq
>>> l = [5,2,6,8,3,5]
>>> heapq.nsmallest(l, 2)
[2, 3]
So just use:
map(lambda x: heapq.nsmallest(x,2)[1], list_of_lists)
It's also usually considered clearer to use a list comprehension, which avoids the lambda altogethe...
How to count the number of set bits in a 32-bit integer?
...
1
2
Next
867
...
How do I get indices of N maximum values in a NumPy array?
...mplest I've been able to come up with is:
In [1]: import numpy as np
In [2]: arr = np.array([1, 3, 2, 4, 5])
In [3]: arr.argsort()[-3:][::-1]
Out[3]: array([4, 3, 1])
This involves a complete sort of the array. I wonder if numpy provides a built-in way to do a partial sort; so far I haven't bee...
How to implement a queue using two stacks?
...
20 Answers
20
Active
...