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Escape regex special characters in a Python string
...
203
Use re.escape
>>> import re
>>> re.escape(r'\ a.*$')
'\\\\\\ a\\.\\*\\$'
>...
How to use timeit module
...random
random.seed('slartibartfast')
s = [random.random() for i in range(1000)]
timsort = list.sort
'''
>>> print min(timeit.Timer('a=s[:]; timsort(a)', setup=setup).repeat(7, 1000))
0.334147930145
Note that the series of statements makes a fresh copy of the unsorted data on every pass....
Are static fields inherited?
...;
int A::MaxHP = 23;
class Cat: A
{
public:
static const int MaxHP = 100;
};
works fine and with different values for A::MaxHP and Cat::MaxHP -- in this case the subclass is "not inheriting" the static from the base class, since, so to speak, it's "hiding" it with its own homonymous one.
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Transpose/Unzip Function (inverse of zip)?
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802
zip is its own inverse! Provided you use the special * operator.
>>> zip(*[('a', 1), ...
More elegant “ps aux | grep -v grep”
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edited Nov 8 '17 at 0:53
answered Feb 21 '12 at 10:31
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数据挖掘——分词入门 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... int strLen = str.length(); //传入字符串的长度
int j = 0;
String matchWord = ""; //根据词库里识别出来的词
int matchPos = 0; //根据词库里识别出来词后当前句子中的位置
while (j < strLen) { //从0字符匹配到字符串...
Insert a line break in mailto body
I would like to insert a line break into my mailto body.
I tried %0A, %0D and %0D%0A. Nothing worked for me.
I tested on Gmail, Yahoo, Apple Mail, Outlook 2010, Outlook.com and Thunderbird with Google Chrome on Mac OSX.
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How to concatenate two MP4 files using FFmpeg?
...peg -i opening.mkv -i episode.mkv -i ending.mkv \
-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a]
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]" output.mkv
Note that this method performs a re-encode.
2. concat demuxer
Use this method when you want...
HTML: How to limit file upload to be only images?
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answered Oct 13 '09 at 19:32
Ms2gerMs2ger
14.5k66 gold badges3333 silver badges3535 bronze badges
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generate days from date range
...ps, procedures, or temp tables. The subquery generates dates for the last 10,000 days, and could be extended to go as far back or forward as you wish.
select a.Date
from (
select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date
from (select 0 as a union all...