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Python: Tuples/dictionaries as keys, select, sort
...uple-dict combination. What you have here is effectively a 2d array (where x = fruit name and y = color), and I am generally a supporter of the dict of tuples for implementing 2d arrays, at least when something like numpy or a database isn't more appropriate. So in short, I think you've got a good a...
Difference between JSON.stringify and JSON.parse
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JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2":true,"key_3":5}"
typeof(ob...
马化腾给创业者的3点建议：行业跨界领域最有机会诞生创新 - 资讯 - 清泛网 ...
...行合伙人沈南鹏联合香港科技大学李泽湘等教授发起的“X科技创业平台”在香港成立。全国政协副主席董建华、香港特别行政区行政长官梁振英、香港创科局局长杨伟雄及中央政府驻港联络办主任张晓明均有出席。
作为“X科...
How to use sed to replace only the first occurrence in a file?
I would like to update a large number of C++ source files with an extra include directive before any existing #includes. For this sort of task, I normally use a small bash script with sed to re-write the file.
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How to convert a string with comma-delimited items to a list in Python?
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Like this:
>>> text = 'a,b,c'
>>> text = text.split(',')
>>> text
[ 'a', 'b', 'c' ]
Alternatively, you can use eval() if you trust the string to be safe:
>>> text = 'a,b,c'
>>> text = eval('[' + text + '...
Best algorithm for detecting cycles in a directed graph [closed]
...rjan's strongly connected components algorithm has O(|E| + |V|) time complexity.
For other algorithms, see Strongly connected components on Wikipedia.
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Standard deviation of a list
...n and standard deviation of 1st, 2nd,... digits of several (Z) lists. For example, I have
8 Answers
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Updating packages in Emacs
... *Packages* buffer (and also update the list of packages), and then type U x.
package-refresh-contents unconditionally tries to download a package list from all repos you've added to package-archives; package-archive-contents is non nil if you have already downloaded the package list.
ELPA is the...
Copying text outside of Vim with set mouse=a enabled
After enabling set mouse=a , text copied inside of Vim will not paste outside of Vim. Does anybody know of a way to fix this?
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What does the comma operator , do?
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The expression:
(expression1, expression2)
First expression1 is evaluated, then expression2 is evaluated, and the value of expression2 is returned for the whole expression.
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