Complementing a Strand of DNA

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Problem

In DNA strings, symbols 'A' and 'T' are complements of each other, as are 'C' and 'G'.

The reverse complement of a DNA string is the string formed by reversing the symbols of , then taking the complement of each symbol (e.g., the reverse complement of "GTCA" is "TGAC").

Given: A DNA string of length at most 1000 bp.

Return: The reverse complement of .

Sample Dataset

AAAACCCGGT

Sample Output

ACCGGGTTTT

翻译，用了一个hash表来弄，比if，switch什么的好用。

file=open('rosalind_revc.txt','r');seq=file.read();print(seq)leng=len(seq);tran={'A':'T','T':'A','C':'G','G':'C'};trna=[];for i in range(0,leng):trna.append(tran[seq[leng-1-i]]);trna_convert=''.join(trna);f=open('out3.txt','w')f.write(trna_convert)f.close

注意：每次用下载的txt都会出现keyerror，是因为我不是按行读取的，直接把文件全部读入，文件最后提行了。多了个\n

list还要先定义，write的时候不能直接是list，不知道怎么写，就把list转成str了，trna_convert=''.join(trna)

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