大约有 46,000 项符合查询结果（耗时：0.0558秒） [XML]
Selecting with complex criteria from pandas.DataFrame
...
Sure! Setup:
>>> import pandas as pd
>>> from random import randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9...
List View Filter Android
I have created a list view in android and I want to add edit text above the list and when the user enter text the list will be filtered according to user input
...
Python `if x is not None` or `if not x is None`?
...he if not x is None version to be more clear, but Google's style guide and PEP-8 both use if x is not None . Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?*
...
How to test multiple variables against a value?
...ying to make a function that will compare multiple variables to an integer and output a string of three letters. I was wondering if there was a way to translate this into Python. So say:
...
JavaScript and Threads
...ol API
WHATWG has a Draft Recommendation for worker threads: Web Workers
And there's also Mozilla’s DOM Worker Threads
Update: June 2009, current state of browser support for JavaScript threads
Firefox 3.5 has web workers. Some demos of web workers, if you want to see them in action:
Simu...
What is :: (double colon) in Python when subscripting sequences?
...
it means 'nothing for the first argument, nothing for the second, and jump by three'. It gets every third item of the sequence sliced.
Extended slices is what you want. New in Python 2.3
share
|
...
Selecting pandas column by location
I'm simply trying to access named pandas columns by an integer.
5 Answers
5
...
How do I put two increment statements in a C++ 'for' loop?
...
A common idiom is to use the comma operator which evaluates both operands, and returns the second operand. Thus:
for(int i = 0; i != 5; ++i,++j)
do_something(i,j);
But is it really a comma operator?
Now having wrote that, a commenter suggested it was actually some special syntactic su...
Is there a way for multiple processes to share a listening socket?
In socket programming, you create a listening socket and then for each client that connects, you get a normal stream socket that you can use to handle the client's request. The OS manages the queue of incoming connections behind the scenes.
...
Why doesn't indexOf work on an array IE8?
The below function works fine on Opera, Firefox and Chrome. However, in IE8 it fails on the if ( allowed.indexOf(ext[1]) == -1) part.
...