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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
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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...
App Inventor 2 Personal Image Classifier (PIC) 拓展：自行训练AI图像识...
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App Inventor 2 Personal Image Classifier (PIC) 拓展：自行训练AI图像识别模型，开发图像识别分类App
PersonalImageClassifier (PIC) 拓展
图像分类App原理介绍
开发...
Any gotchas using unicode_literals in Python 2.6?
We've already gotten our code base running under Python 2.6. In order to prepare for Python 3.0, we've started adding:
6 A...
Reshaping data.frame from wide to long format
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edited Oct 21 '19 at 10:33
Jaap
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The tilde operator in Python
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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?
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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?
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20 Answers
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pandas DataFrame: replace nan values with average of columns
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283
You can simply use DataFrame.fillna to fill the nan's directly:
In [27]: df
Out[27]:
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