python - 属性错误 : 'str' object has no attribute 'maketrans'

Question

def complement(dna):
    transtable = dna.maketrans('acgtnACGTN', 'tgcanTGCAN')
    return dna.translate(transtable)

import string
dna = raw_input("Enter DNA sequence: ")
print "Reverse Complement is: ", complement(dna)

我已经检查过 dir (string) 并且没有 maketrans。有没有办法导入 maketrans？

Answer 1

这适用于 Python 3.4:

def complement(dna):
    transtable = dna.maketrans('acgtnACGTN', 'tgcanTGCAN')
    return dna.translate(transtable)

print(complement('TGA'))

这是 Python 2.7 的:

from __future__ import print_function
import string

def complement(dna):
    transtable = string.maketrans('acgtnACGTN', 'tgcanTGCAN')
    return dna.translate(transtable)

print(complement('TGA'))

这为您提供了运行脚本的主要 Python 版本:

import sys

print(sys.version_info.major)