另外,perl5.6及更高版本的sort使用Mergesort算法,而5.6之前的sort使用Quicksort算法,前者显然快于后者,所以,要想求速度,也要升级你的perl版本哦。 (三)CPAN上关于sort的一些模块 File::Sort-Sortoneormoretextfilesbylines Sort::Fields-Sortlinesusingoneormorecolumnsasthesortkey(s) Sort::ArbBiLex-Constructsortfunctionsforarbitrarysortorders Text::BibTeX:...
然后将其拆分为行，并将其输入Schwartzian变换（decorate-sort-undecorate），在此过程中反转日期格式--将...
,columns=['col2','col1']) print (unsorted_df) # 按标签排序 sorted_df = unsorted_df.sort...
Reverse Pairs on the Floor The examples used here are from the weekly challenge problem statement and demonstrate the working solution. Part 1 You are given an array of integers. Write a script to return the number of reverse pairs in the given array. Solution use v5.38; sub reverse_pair...
matches only once, Failed matches don't reset the match variables Subroutine, Signal, Sorting Traps Barewords that used to look like strings look like subroutine calls, Reverse is no longer allowed as the name of a sort subroutine, "warn()" won't let you specify a filehandle OS Traps ...
$ perl -lane'$F[2]=reverse $F[2]=~tr/ATGC/TACG/r; print "@F"'test.txt ABC DEF CTAATC GHK ABC DEF GACGCC GHK ABC DEF GGAATT GHK Sort a CSV row How aboutsorting rows in csv file without header & first column? Here’s some simple comma-separated values: ...
1.7. Reversing a String by Word or Character Problem You want to reverse the words or characters of a string. Solution Use the reverse function in scalar context for flipping characters: $revchars = reverse($string); To flip words, use reverse in list context with split and join: $revwo...
return print reverse sort num values %array; return print(reverse(sort num (values(%array))); When in doubt, parenthesize. At the very least it will let some poor schmuck bounce on the % key invi. Even if you aren't in doubt, consider the mental welfare of the person who has to ...
s/([^ ]*) *([^ ]*)/$2 $1/; # reverse 1st two fields Note the use of $ instead of \ in the last example. Unlike sed, we only use the \<digit> form in the left hand side. Anywhere else it's $<digit>. Occasionally, you can't just use a /g to get all the changes...
perl 常用模块使用例子---欢迎大家补充。 一些常用模块的简单描述 http://www.perldoc.com/perl5.6/pod/perlmodlib.html 在perl 中使用模块: 模块的下载地址:http://www.cpan.org/modules/01modules.index.html 安装模块: 1. perl Makefile.PL 2. ...