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How can I create a Set of Sets in Python?
...
121
Python's complaining because the inner set objects are mutable and thus not hashable. The solut...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...件服务器，公司全部员工使用统一的域名，内网IP为：192.168.0.115
操作系统：RHEL5
所用软件列表：
mysql-5.5.20
postfix-2.9.1
courier-authlib-0.62.4.tar.bz2
extmail-1.2.tar.gz
extman-1.1.tar.gz
Unix-Syslog-1.1.tar.gz
perl-GD-2.35-1.el5.rf.i386.rpm...
Pandas every nth row
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207
I'd use iloc, which takes a row/column slice, both based on integer position and following nor...
PHP case-insensitive in_array function
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102
you can use preg_grep():
$a= array(
'one',
'two',
'three',
'four'
);
print_r( preg_grep( "...
How to swap the buffers in 2 windows emacs
I am using emacs I find that sometimes I have 2 files separated into 2 windows.
8 Answers
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App Inventor 2 LLMAI2Ext 自研拓展：接入DeepSeek、Kimi、通义千问...等国...
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 LLMAI2Ext 自研拓展：接入D...
How do I convert dates in a Pandas data frame to a 'date' data type?
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112
Use astype
In [31]: df
Out[31]:
a time
0 1 2013-01-01
1 2 2013-01-02
2 3 2013-...
Effective way to find any file's Encoding
... not have a BOM, this cannot determine the file's encoding.
*UPDATED 4/08/2020 to include UTF-32LE detection and return correct encoding for UTF-32BE
/// <summary>
/// Determines a text file's encoding by analyzing its byte order mark (BOM).
/// Defaults to ASCII when detection of the text f...
How to get first and last day of previous month (with timestamp) in SQL Server
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228
select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0) --First day of previous month
select...
How to return multiple lines JSX in another return statement in React?
...of the tags as function calls (see docs). Then the first one becomes:
{[1,2,3].map(function (n) {
return React.DOM.p(...);
})}
And the second one:
{[1,2,3].map(function (n) {
return (
React.DOM.h3(...)
React.DOM.p(...)
)
})}
It should now be clear that the second snippet doesn't ...