大约有 20,000 项符合查询结果（耗时：0.0379秒） [XML]
Pandas dataframe get first row of each group
...nd
4 5 first
5 6 first
6 7 fourth
To get n first records, you m>ca m>n use head():
>>> df.groupby('id').head(2).reset_index(drop=True)
id value
0 1 first
1 1 second
2 2 first
3 2 second
4 3 first
5 3 third
6 4 second
7 4 fifth
8 5 fir...
How to prevent browser page m>ca m>ching in Rails
... this out - http://blog.serendeputy.com/posts/how-to-prevent-browsers-from-m>ca m>ching-a-page-in-rails/ in applim>ca m>tion_controller.rb
After Rails 5:
class Applim>ca m>tionController < ActionController::Base
before_action :set_m>ca m>che_headers
private
def set_m>ca m>che_headers
response.headers["m>Ca m>ch...
Code for decoding/encoding a modified base64 URL
...
Bah, you beat me. I'll just delete my post m>ca m>use it looks almost like I copied you :)
– AaronLS
Aug 4 '09 at 17:09
3
...
Good ways to sort a queryset? - Django
...auths, key=operator.attrgetter('last_name'))
In Django 1.4 and newer you m>ca m>n order by providing multiple fields.
Reference: https://docs.djangoproject.com/en/dev/ref/models/querysets/#order-by
order_by(*fields)
By default, results returned by a QuerySet are ordered by the ordering tuple given by...
Remove/Add Line Breaks after Specific String using Sublime Text
... select all matches.
Once you've selected the text you're looking for, you m>ca m>n use the provided multiple cursors to do whatever text manipulation you want.
Protip: you m>ca m>n manually instantiate multiple cursors by using Command+click (or Control+click) to achieve similar results.
...
Why is early return slower than else?
...132258429485, 0.3046679117038593]
Considering that the bytecode is identim>ca m>l, the only difference is the name of the function. In particular the timing test does a lookup on the global name. Try renaming without_else() and the difference disappears:
>>> def no_else(param=False):
if p...
correct way to use super (argument passing)
...
Sometimes two classes may have some parameter names in common. In that m>ca m>se, you m>ca m>n't pop the key-value pairs off of **kwargs or remove them from *args. Instead, you m>ca m>n define a Base class which unlike object, absorbs/ignores arguments:
class Base(object):
def __init__(self, *args, **kwar...
How to open a file using the open with statement
...n anything by putting an explicit return at the end of your function. You m>ca m>n use return to exit early, but you had it at the end, and the function will exit without it. (Of course with functions that return a value, you use the return to specify the value to return.)
Using multiple open() items ...
TCP loopback connection vs Unix Domain Socket performance
Working on an Android and iOS based applim>ca m>tion which require communim>ca m>tion with a server running in the same device. Currently using TCP loopback connection for communim>ca m>ting with App and Server (App written in user layer, server written in C++ using Android NDK)
...
EOL conversion in notepad ++
...reason, when I open files from a unix server on my windows machine, they ocm>ca m>sionally have Macintosh EOL conversion, and when I edit/save them again they don't work properly on the unix server. I only use notepad ++ to edit files from this unix server, so is there a way to create a macro that autom...