在Python轉換的大量項目進入單項線列表

Question

我想線轉換成文本文件，從這個：

animal cat, mouse, dog, horse 
numbers 22,45,124,87 

這樣：

animal cat 
animal mouse 
animal dog 
animal horse 
numbers 22 
numbers 45 
numbers 124 
numbers 87 

我怎麼會做這種轉換在python中？

謝謝

Answer 1

使用collections.defaultdict。

你可能想搜索SO的類似問題。

Answer 2

with open('thefile.txt') as fin: 
    with open('result.txt') as fou: 
    for line in fin: 
     key, values = line.split(None, 1) 
     vs = [x.strip() for x in values.split(',')] 
     for v in vs: 
      fou.write('%s %s\n' % (key, v)) 

Answer 3

拉鍊，你可以這樣做：

inp="""animal cat, mouse, dog, horse 
numbers 22,45,124,87 
""" 
for line in inp.splitlines(): 
    key,data = line.split(None,1) 
    print '\n'.join("%s%8s" % line 
        for line in zip([key.strip()] * (data.count(',')+1), 
            (item.strip() for item in data.split(','))))