大约有 5,816 项符合查询结果（耗时：0.0331秒） [XML]
Putting a simple if-then-else statement on one line [duplicate]
...if syntax
fruit = 'Apple'
isApple = True if fruit == 'Apple' else False
vs
fruit = 'Apple'
isApple = False
if fruit == 'Apple' : isApple = True
share
|
improve this answer
|
...
Delete last char of string
...for example http://blogs.msdn.com/b/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx)
Using some LINQ:
string strgroupids = groupIds.Aggregate(string.Empty, (p, q) => p + q + ',');
strgroupids = strgroupids.Substring(0, str1.Length - 1);
Without end-substringing:
string strgroupids = g...
Difference between e.target and e.currentTarget
...
Here is a good example: joequery.me/code/event-target-vs-event-currenttarget-30-seconds
– Glenn Wark
Mar 1 '17 at 15:51
add a comment
|...
How to create a directory in Java?
...
mkdir vs mkdirs
If you want to create a single directory use mkdir
new File("/path/directory").mkdir();
If you want to create a hierarchy of folder structure use mkdirs
new File("/path/directory").mkdirs();
...
Parsing HTML using Python
...ml is extremely fast:
http://blog.dispatched.ch/2010/08/16/beautifulsoup-vs-lxml-performance/
http://www.ianbicking.org/blog/2008/03/python-html-parser-performance.html
And with cssselect it’s quite easy to use for scraping HTML pages too:
from lxml.html import parse
doc = parse('http://www.g...
Throw away local commits in Git
...
@TarunKumar THANK YOU! I am using VS integration, and your solution was the only way I was able to wipe out a bunch of merge commits that I didn't want in a branch I didn't have permission to check in.
– DVK
Nov 13 '18 a...
Combining two Series into a DataFrame in pandas
...at you should prefer doing the concat once pd.concat([list_of_dataframes]) vs concating many times new_df = pd.DataFrame(); for df in list_of_dsf: new_df = pd.concat([new_df, df]) or similar.
– Andy Hayden
Oct 14 '15 at 22:07
...
How to determine the screen width in terms of dp or dip at runtime in Android?
...tant difference between using Configuration's screenWidthDp/screenHeightDp vs DisplayMetrics widthPixels/heightPixels is Configuration returns the usable display dimensions (minus the status bar etc), while DisplayMetrics returns the full screen dimensions.
– Nick Baicoianu
...
Selecting/excluding sets of columns in pandas [duplicate]
... It seems that the drop method is slightly faster (~515 µs vs ~680 µs), at least in some tests on a 15611 rows x 5 columns dataframe of which I wanted to drop 3 columns, in python 3.6 and pandas 0.20.3.
– bli
Nov 8 '17 at 17:12
...
Number of processors/cores in command line
...ams with thread pools, you really need to know the count of physical cores vs cores/hyperthreads. That said, you can modify the following script to get the answers that you need.
#!/bin/bash
MODEL=`cat /cpu/procinfo | grep "model name" | sort | uniq`
ALL=`cat /proc/cpuinfo | grep "bogo" | wc -l`...