大约有 48,000 项符合查询结果（耗时：0.0739秒） [XML]
How to compare two strings in dot separated version format in Bash?
...ny way to compare such strings on bash, e.g.: 2.4.5 and 2.8 and 2.4.5.1 ?
29 Answers
...
What are the differences between json and simplejson Python modules?
...
13 Answers
13
Active
...
Counting the occurrences / frequency of array elements
...
1
2
Next
96
...
Get the cartesian product of a series of lists?
...
13 Answers
13
Active
...
Validating IPv4 addresses with regexp
...uch luck. It seemed at one point I had had it with (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4} , but it produces some strange results:
...
Pandas index column title or name
...'
In [8]: df.index.name = 'foo'
In [9]: df.index.name
Out[9]: 'foo'
In [10]: df
Out[10]:
Column 1
foo
Apples 1
Oranges 2
Puppies 3
Ducks 4
share
|
...
What does -1 mean in numpy reshape?
...atrix can be reshaped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
9 Answer...
Expand a random range from 1–5 to 1–7
Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.
...
Assign multiple columns using := in data.table, by group
...
162
This now works in v1.8.3 on R-Forge. Thanks for highlighting it!
x <- data.table(a = 1:3, ...
How to drop columns by name in a data frame
...
11 Answers
11
Active
...