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Matrix Transpose in Python
...t;> theArray = [['a','b','c'],['d','e','f'],['g','h','i']]
>>> zip(*theArray)
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i')]
Python 3:
>>> [*zip(*theArray)]
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i')]
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Fastest way to download a GitHub project
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When you are on a project page, you can press the 'Download ZIP' button which is located under the "Clone or Download" drop down:
This allows you to download the most recent version of the code as a zip archive.
If you aren't seeing that button, it is likely because you aren't on...
How to sort an array of hashes in ruby
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Simples:
array_of_hashes.sort_by { |hsh| hsh[:zip] }
Note:
When using sort_by you need to assign the result to a new variable: array_of_hashes = array_of_hashes.sort_by{} otherwise you can use the "bang" method to modify in place: array_of_hashes.sort_by!{}
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Pairs from single list
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My favorite way to do it:
from itertools import izip
def pairwise(t):
it = iter(t)
return izip(it,it)
# for "pairs" of any length
def chunkwise(t, size=2):
it = iter(t)
return izip(*[it]*size)
When you want to pair all elements you obviously might need a...
RSA 算法是如何诞生的 - 创意 - 清泛网 - 专注C/C++及内核技术
...到了一些方案。尽管 Adleman 不情愿参与其中，他们还是会把结果拿给 Adleman，Adleman 的角色就是逐个击破这些方案，找出各种漏洞，给那两个头脑发热的人泼点冷水，免得他们走弯路。
三人走火入魔一般，吃饭聊、喝酒聊，甚至...
Reverse engineering from an APK file to a project
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@sri just rename the apk file to zip and extract it, you will have the resource files in res folder
– Hoang Huynh
Nov 5 '13 at 3:58
8
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Element-wise addition of 2 lists?
...ator import add
>>> list( map(add, list1, list2) )
[5, 7, 9]
or zip with a list comprehension:
>>> [sum(x) for x in zip(list1, list2)]
[5, 7, 9]
Timing comparisons:
>>> list2 = [4, 5, 6]*10**5
>>> list1 = [1, 2, 3]*10**5
>>> %timeit from operator im...
C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
... (gdb) quit --退出gdb
果然
我们“不小心”把&i写成了i
而我们刚开始初始化了i为0,这样我们不是试图向内存地址0存放一个值吗？实际上很多情况下，你即使没有初始化为零，默认也可能是0，所以要特别注意。
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的SP是空格，Char是字符，Value是其索引值） 编码的过程是把字符两两分组，然后转成下表的45进制，然后转成11bits的二进制，如果最后有一个落单的，那就转成6bits的二进制。而编码模式和字符的个数需要根据不同的Version尺寸编...
关于App Inventor 2过程积木，被问最多的6个问题 - App应用开发 - 清泛IT社...
..."）是让代码从"能跑"升级到"好维护"的关键一步。今天我把社区里关于过程积木的高频问题整理出来，一次性讲透。<br><br><br><b>Q1: 过程和无返回值过程到底有什么区别？</b><br><br><br><b>A:</b> 这是过程积木面板里的两个块，长得像...