同时 .replace 功能 [英] Simultaneous .replace functionality

问题描述

我已经将用户输入的DNA代码(A,T,G,C)转换成RNA代码(A,U,G,C).这很容易

RNA_Code=DNA_Code.replace('T','U')

现在我需要做的下一件事是将 RNA_Code 转换成它的互补链.这意味着我需要用 U 替换 A，用 A 替换 U，用 C 替换 G，用 G 替换 C，但所有这些都是同时发生的.

如果我说

RNA_Code.replace('A','U')RNA_Code.replace('U','A')

它将所有的 As 转换为 Us，然后将所有的 Us 转换为 As，但我只剩下所有的 As.

我需要它把类似 AUUUGCGGCAAA 的东西转换成 UAAACGCCGUUU.

关于如何完成这项工作的任何想法?(3.3)

解决方案

使用翻译表:

RNA_compliment = {ord('A'):'U', ord('U'):'A',ord('G'):'C', ord('C'):'G'}RNA_Code.translate(RNA_compliment)

str.translate() 方法 获取从代码点(数字)到替换字符的映射.ord() 函数 给了我们一个给定字符的代码点，可以轻松构建您的地图.

演示:

<预><代码>>>>RNA_compliment = {ord('A'):'U', ord('U'):'A', ord('G'):'C', ord('C'):'G'}>>>'AUUUGCGGCAAA'.translate(RNA_compliment)'UAAACGCCGUUU'

I have already converted user input of DNA code (A,T,G,C) into RNA code(A,U,G,C). This was fairly easy

RNA_Code=DNA_Code.replace('T','U')

Now the next thing I need to do is convert the RNA_Code into it's compliment strand. This means I need to replace A with U, U with A, G with C and C with G, but all simultaneously.

if I say

RNA_Code.replace('A','U')
RNA_Code.replace('U','A')

it converts all the As into Us then all the Us into As but I am left with all As for both.

I need it to take something like AUUUGCGGCAAA and convert it to UAAACGCCGUUU.

Any ideas on how to get this done?(3.3)

解决方案

Use a translation table:

RNA_compliment = {
    ord('A'): 'U', ord('U'): 'A',
    ord('G'): 'C', ord('C'): 'G'}

RNA_Code.translate(RNA_compliment)

The str.translate() method takes a mapping from codepoint (a number) to replacement character. The ord() function gives us a codepoint for a given character, making it easy to build your map.

Demo:

>>> RNA_compliment = {ord('A'): 'U', ord('U'): 'A', ord('G'): 'C', ord('C'): 'G'}
>>> 'AUUUGCGGCAAA'.translate(RNA_compliment)
'UAAACGCCGUUU'

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