替换字符的 Pythonic 方法 [英] Pythonic way to replace chars

问题描述

我想使用 pythonic 方法替换字符串中的一些字符.

A ->吨C->GG->CT->一个

示例:

<块引用>

AAATCGATTGAT

会变成

<块引用>

TTTAGCTAACTA

我做了什么:

def 交换(字符串):string = re.sub('A', 'aux', string)string = re.sub('T', 'A', 字符串)string = re.sub('aux', 'T', string)string = re.sub('C', 'aux', string)string = re.sub('G', 'C', 字符串)string = re.sub('aux', 'G', string)返回字符串

效果很好，但我正在寻找一种更 Pythonic 的方式来实现这一点.

解决方案

这是对 当前接受的 Chepner 删除的 答案的重构，该答案仅调用 maketrans 一次.

tt = str.maketrans({A":T"，C":G"，G":C"，T":;A"})对于AGACAT"、TAGGAC"、ACTAGAA"中的 s1:打印(s1.translate(tt))

也许还指出，您可以将 replace 的结果链接起来，尽管这仍然很笨拙且效率低下:

def acgtgca(s1):返回 s1.replace(A", ue0fa").replace(G", ue0fb").replace(C", G").replace(T", A").replace(ue0fb", C").replace(ue0fa"，T")

这避免了使用aux"作为支持 Unicode 私人使用区域中的两个任意字符的特殊标记.>

但同样，maketrans 方法既简洁又高效.

I want to replace some characters in a string using a pythonic approach.

A -> T
C -> G
G -> C
T -> A

Example:

AAATCGATTGAT

will transform into

TTTAGCTAACTA

What I did:

def swap(string):
    string = re.sub('A', 'aux', string)
    string = re.sub('T', 'A', string)
    string = re.sub('aux', 'T', string)
    string = re.sub('C', 'aux', string)
    string = re.sub('G', 'C', string)
    string = re.sub('aux', 'G', string)

    return string

It worked great, but i'm looking for a more pythonic way to reach that.

解决方案

Here's a refactoring of the currently accepted- Chepner's deleted answer which only calls maketrans once.

tt = str.maketrans({"A":"T", "C":"G", "G":"C", "T": "A"})
for s1 in "AGACAT", "TAGGAC", "ACTAGAA":
    print(s1.translate(tt))

Perhaps also point out that you can chain the result from replace, though this is still clumsy and inefficient:

def acgtgca(s1):
    return s1.replace(
        "A", "ue0fa").replace(
        "G", "ue0fb").replace(
        "C", "G").replace(
        "T", "A").replace(
        "ue0fb", "C").replace(
        "ue0fa", "T")

This avoids using "aux" as a special marker in favor of two arbitrary characters out of the Unicode Private Use Area.

But again, the maketrans method is both neater and more efficient.

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