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How to express infinity in Ruby?
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If you use ruby 1.9.2, you can use:
>> Float::INFINITY #=> Infinity
>> 3 < ...
What is the pythonic way to detect the last element in a 'for' loop?
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154
Most of the times it is easier (and cheaper) to make the first iteration the special case inst...
Listing all permutations of a string/integer
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158
First of all: it smells like recursion of course!
Since you also wanted to know the principle,...
Mapping two integers to one, in a unique and deterministic way
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Select multiple columns in data.table by their numeric indices
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For versions of data.table >= 1.9.8, the following all just work:
library(data.table)
dt &...
how to check the dtype of a column in python pandas
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You can access the data-type of a column with dtype:
for y in agg.columns:
if(agg[y].dtyp...
How can I find the length of a number?
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海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...就拿最简单的两个数据使用Apache提供的 Levenshtein for 循环100w次计算这两个数据的相似度。代码结果如下：
String s1 = "你妈妈喊你回家吃饭哦，回家罗回家罗" ;
String s2 = "你妈妈叫你回家吃饭啦，回家罗回家罗" ;
long t1 = System.c...
`elif` in list comprehension conditionals
...essions were designed exactly for this sort of use-case:
>>> l = [1, 2, 3, 4, 5]
>>> ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l]
['yes', 'no', 'idle', 'idle', 'idle']
Hope this helps :-)
s...