在python中将包含多个项目的列表转换为单个项目行

我想从以下内容转换文本文件中的行：

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

为此：

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

如何在python中进行此转换

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谢谢

使用

collections.defaultdict

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您可能希望搜索类似的问题

使用

collections.defaultdict

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))

---

您可能希望搜索类似的问题

使用zip，您可以执行以下操作：

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))

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(','))))

---

使用zip，您可以执行以下操作：

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(','))))