大约有 45,000 项符合查询结果（耗时：0.0525秒） [XML]
What is Unicode, UTF-8, UTF-16?
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+250
Why do we need Unicode?
In the (not too) early days, all that existed was ASCII. This was okay, as all that would ever be needed we...
Select first row in each GROUP BY group?
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On Oracle 9.2+ (not 8i+ as originally stated), SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OV...
Regex group capture in R with multiple capture-groups
...p in the match (and one for the whole match):
> s = c("(sometext :: 0.1231313213)", "(moretext :: 0.111222)")
> str_match(s, "\\((.*?) :: (0\\.[0-9]+)\\)")
[,1] [,2] [,3]
[1,] "(sometext :: 0.1231313213)" "sometext" "0.1231313213"
[2,] "(moretext :...
Unzipping files in Python
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edited Sep 24 '19 at 20:09
answered Aug 10 '10 at 16:23
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How to create an empty file at the command line in Windows?
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32 Answers
32
Active
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Detecting iOS / Android Operating system
...ch is a place to download an application. So he doesn't have to print out 2 QR codes on a page, I'd like to detect the current operating system (Apple/Android/Other[not supported]) and modify my elements based on that value.
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Writing a Python list of lists to a csv file
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312
Python's built-in CSV module can handle this easily:
import csv
with open("output.csv", "wb") ...
How do I create a namespace package in Python?
...rate downloads. For example, with the directories Package-1 and Package-2 in PYTHONPATH ,
5 Answers
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