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Pandas - How to flatten a hierarchical index in columns
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edited Jan 17 '14 at 19:36
answered Jan 24 '13 at 18:37
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top命令使用详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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系统负载，即任务队列的平均长度。
三个数值分别为 1分钟、5分钟、15分钟前到现在的平均值。
第二、三行为进程和CPU的信息。当有多个CPU时，这些内容可能会...
How can I calculate an md5 checksum of a directory?
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153
find /path/to/dir/ -type f -name "*.py" -exec md5sum {} + | awk '{print $1}' | sort | md5sum
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Truncate number to two decimal places without rounding
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What are the differences between NP, NP-Complete and NP-Hard?
...e answer to y is yes, if and only if the answer to f(y) is yes.
Example
3-SAT. This is the problem wherein we are given a conjunction (ANDs) of 3-clause disjunctions (ORs), statements of the form
(x_v11 OR x_v21 OR x_v31) AND
(x_v12 OR x_v22 OR x_v32) AND
... AND
(x_v1n ...
How can you do anything useful without mutable state?
... {
Stack<int> x = Stack.Cons(1, Stack.Cons(2, Stack.Cons(3, Stack.Cons(4, null))));
Stack<int> y = Stack.Cons(5, Stack.Cons(6, Stack.Cons(7, Stack.Cons(8, null))));
Stack<int> z = Stack.Append(x, y);
Stack.Iter(z, a => Console.Writ...
variable === undefined vs. typeof variable === “undefined”
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370
For undeclared variables, typeof foo will return the string literal "undefined", whereas the i...
ValueError : I/O operation on closed file
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edited May 19 at 16:30
Boris
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answered Sep ...
Downloading a Google font and setting up an offline site that uses it
...tp://fonts.googleapis.com/css?family=Open+Sans:400italic,600italic,400,600,300
For an example
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 300;
src: local('Open Sans Light'), local('OpenSans-Light'), url(http://themes.googleusercontent.com/static/fonts/opensans...