如何仅选择某些子字符串 [英] How to select only certain Substrings

问题描述

从一个字符串说dna ='ATAGGGATAGGGAGAGAGAGCGATCGAGCTAG' 我得到了子字符串说dna.format ='ATAGGGATAG'，'GGGAGAGAG' 我只想打印长度可被3整除的子字符串 怎么做?即时通讯使用模，但无法正常工作！

from a string say dna = 'ATAGGGATAGGGAGAGAGCGATCGAGCTAG' i got substring say dna.format = 'ATAGGGATAG','GGGAGAGAG' i only want to print substring whose length is divisible by 3 how to do that? im using modulo but its not working !

import re
if mydna = 'ATAGGGATAGGGAGAGAGCAGATCGAGCTAG'
print re.findall("ATA"(.*?)"AGA" , mydna)
if len(mydna)%3 == 0
   print mydna

更正后的代码

import re
mydna = 'ATAGGGATAGGGAGAGAGCAGATCGAGCTAG'
re.findall("ATA"(.*?)"AGA" , mydna.format)
if len(mydna.format)%3 == 0:
   print mydna.format

这仍然不能为我提供长度可被三整除的子字符串. .知道有什么问题吗?

this still doesnt give me substring with length divisible by three . . any idea whats wrong ?

我希望只打印长度可被3整除的子字符串

im expecting only substrings which has length divisible by three to be printed

推荐答案

您还可以为此使用正则表达式:

You can also use the regular expression for that:

re.findall('ATA((...)*?)AGA', mydna)

内部括号一次匹配3个字母.

the inner braces match 3 letters at once.

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