删除线

Question

我有一个看起来像

geneA geneB 134 
geneC geneF 395 
geneH geneD 958 
geneF geneC 395 
geneB geneA 134 
geneD geneH 958 

我想删除具有相同的基因（即在相反的顺序）行的文件，所以我只是得到

geneA geneB 134 
geneC geneF 395 
geneH geneD 958  

我有这个到目前为止，但当我尝试使用replace（）或if语句时，我得到更多的重复。任何想法如何我可以改变这一点？

with open(filename, 'r') as handle, open(outfilename, 'a') as w: 

    for line in handle: 
     element = line.split() 
     gene1 = element[0] 
     gene2 = element[1] 

     for line in handle: 
      matchingelement = line.split() 
      gene3 = matchingelement[0] 
      gene4 = matchingelement[1] 

      if gene3 == gene2 and gene4 == gene1: 
       """Remove the line""" 

Answer 1

将这些基因转换成一个可排列的形式，可以将它添加到一个集合中，并随着您的行为进行检查。在这个例子中，我对基因进行了排序，以便顺序无关紧要，然后将它们构建回单个“标准化”字符串。

filename = 'a.txt' 
outfilename = 'aout.txt' 

seen = set() 

with open(filename, 'r') as handle, open(outfilename, 'a') as w: 
    for line in handle: 
     element = line.split() 
     # a hashable "normalized" view of the genes 
     genes = '-'.join(sorted(element[0:2])) 
     if genes not in seen: 
      seen.add(genes) 
      w.write(line) 

print(open(outfilename).read())