大约有 48,000 项符合查询结果（耗时：0.0833秒） [XML]
How can I make pandas dataframe column headers all lowercase?
...
180
You can do it like this:
data.columns = map(str.lower, data.columns)
or
data.columns = [x....
How do you get the magnitude of a vector in Numpy?
... only one obvious way to do it", how do you get the magnitude of a vector (1D array) in Numpy?
6 Answers
...
How can I list (ls) the 5 last modified files in a directory?
...y using head or tail. If you want the 5 most-recently modified files:
ls -1t | head -5
The -1 (that's a one) says one file per line and the head says take the first 5 entries.
If you want the last 5 try
ls -1t | tail -5
...
Return two and more values from a method
...
160
def sumdiff(x, y)
return x+y, x-y
end
#=> nil
sumdiff(3, 4)
#=> [7, -1]
a = sumdiff(...
How to randomly sort (scramble) an array in Ruby?
...
Built in now:
[1,2,3,4].shuffle => [2, 1, 3, 4]
[1,2,3,4].shuffle => [1, 3, 2, 4]
share
|
improve this answer
|
...
Bare asterisk in function arguments?
...
|
edited May 23 '17 at 11:55
Community♦
111 silver badge
answered Jan 13 '13 at 8:50
...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
...
114
As a hobbyist operating system writer, I found that because paging (a major part of the modern...
What does Bump Version stand for?
...
271
It means to increment the version number to a new, unique value.
...
Maven check for updated dependencies in repository
...t; 2.0.9
[INFO] org.codehaus.plexus:plexus-utils ....................... 1.1 -> 1.5.6
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time:...
How to merge lists into a list of tuples?
...
In Python 2:
>>> list_a = [1, 2, 3, 4]
>>> list_b = [5, 6, 7, 8]
>>> zip(list_a, list_b)
[(1, 5), (2, 6), (3, 7), (4, 8)]
In Python 3:
>>> list_a = [1, 2, 3, 4]
>>> list_b = [5, 6, 7, 8]
>>> list(zip(list...