somebody oneday

Transcribing DNA into RNA 第二题也很简单，不过python还是有很多细节要注意。比如string 是不可变数据类型，可见转载17个新手常见Python运行时错误 file=open('rosalind_rna.txt','r'); seq=file.read(); leng=len(seq); for i in range(0,leng): if se

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 ,

第一题很简单，但是没怎么用过python，一道题中还是学到很多。counting DNA nucleotide dna=open('rosalind_dna.txt','r'); 这只是一个句柄而已，需要read（）或者 readline() 读入文件内容。 len(seq) 定义dict 还好只有4个碱基，但是以后肯定会需要更方便的定义。 d={'A':0,'C':0,'G':0,'T'

Problem The GC-content of a DNA string is given by the percentage of symbols in the string that are 'C' or 'G'. For example, the GC-content of "AGCTATAG" is 37.5%. Note that the reverse complem

Problem A sequence is an ordered collection of objects (usually numbers), which are allowed to repeat. Sequences can be finite or infinite. Two examples are the finite sequence (π,−2√,0,π) and

Problem Figure 2. The Hamming distance between these two strings is 7. Mismatched symbols are colored red. Given two strings  and  of equal length, the Hamming distance between  and ,