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How to switch position of two items in a Python list?
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i = ['title', 'email', 'password2', 'password1', 'first_name',
'last_name', 'next', 'newsletter']
a, b = i.index('password2'), i.index('password1')
i[b], i[a] = i[a], i[b]
share
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汇编语言（王爽著）附书签 - 文档下载 - 清泛网 - 专注C/C++及内核技术
...的命令。
这是一本入门的汇编语言教材
关于内容：1、内容真的是做到了深入浅出（书是给人看的，别人看懂了才是最关键的）。2、有的地方看的出来是老师自己的感悟（不像其它国内大多数的书，就知道东抄一点西搬一点...
How do I detect what .NET Framework versions and service packs are installed?
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13 Answers
13
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为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...展，当然同时也刺激了国产自主计算技术的突破。
7月31日，中国商务部、海关总署发布联合公告，为维护国家安全，自8月15日起，对部分无人驾驶航空飞行器和高性能计算机实施出口管制。
无人驾驶航空飞行器和无人驾驶飞...
Extract a substring according to a pattern
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Here are a few ways:
1) sub
sub(".*:", "", string)
## [1] "E001" "E002" "E003"
2) strsplit
sapply(strsplit(string, ":"), "[", 2)
## [1] "E001" "E002" "E003"
3) read.table
read.table(text = string, sep = ":", as.is = TRUE)$V2
## [1] "E001" "E002...
Get the last non-empty cell in a column in Google Sheets
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16 Answers
16
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What does the “|” (single pipe) do in JavaScript?
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159
This is a bitwise or.
Since bitwise operations only make sense on integers, 0.5 is truncated.
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How can I add a help method to a shell script?
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177
here's an example for bash:
usage="$(basename "$0") [-h] [-s n] -- program to calculate the an...
How to swap keys and values in a hash
...was inverted (in essence, by letting you access keys through values):
{a: 1, b: 2, c: 3}.key(1)
=> :a
If you want to keep the inverted hash, then Hash#invert should work for most situations:
{a: 1, b: 2, c: 3}.invert
=> {1=>:a, 2=>:b, 3=>:c}
BUT...
If you have duplicate values,...
Why does this assert throw a format exception when comparing structures?
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100
I've got it. And yes, it's a bug.
The problem is that there are two levels of string.Format g...