String 从文本中删除重复的单词

我有以下字符串的文本：

{whatever}:::duplicateString:::{whatever}
{whatever}:::duplicateString:::{whatever}
....
{whatever}:::duplicateString:::{whatever}
{whatever}:::duplicateString:::{whatever}

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如何从文本中删除重复字符串：主要思想是，如果第二个单词出现多次，则将其从行中删除

第一个想法是逐行读取它们并按“：”分割，以便创建数组并通过向树集添加条目来迭代数组。好。但是怎样才能把线重新粘起来呢

我想不起来有什么机制可以解决这样的问题。。语言不重要，只是解决方案

示例文本：

Appliances:::Main
Appliances:::Main:::Appliance Warranties
Appliances:::Main:::Beer Keg Refrigerators
Appliances:::Main:::Beverage Refrigerators
Appliances:::Main:::Ceiling Fans & Accessories
Appliances:::Main:::Ceiling Fans & Accessories:::Accessories
Appliances:::Main:::Ceiling Fans & Accessories:::Accessories:::Downrod Couplers
Appliances:::Main:::Ceiling Fans & Accessories:::Accessories:::Downrods
Appliances:::Main:::Ceiling Fans & Accessories:::Accessories:::Fan Replacement Blades

理想情况下，它必须如下所示：

Appliances:::Main
Appliances:::Appliance Warranties
Appliances:::Beer Keg Refrigerators
Appliances:::Beverage Refrigerators
Appliances:::Ceiling Fans & Accessories
Appliances:::Ceiling Fans & Accessories:::Accessories
Appliances:::Ceiling Fans & Accessories:::Accessories:::Downrod Couplers
Appliances:::Ceiling Fans & Accessories:::Accessories:::Downrods
Appliances:::Ceiling Fans & Accessories:::Accessories:::Fan Replacement Blades

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如果duplicateString可能只作为第二个单词出现，您可以（在Python中）执行以下操作：

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在duplicateString之前只有一个单词，但之后可以出现任何数量的单词，以“：：”分隔。很难确定您在这里要查找的是什么。你能在前后显示你的字符串以便更清楚吗？所以在第一行你不想删除这个词。是的。只是复制了第二个单词，保存了剩余的行。如果单词只在第一行-没有重复=）我刚刚更新了我的答案，以反映如果单词与前一行相同，您希望删除该单词。我想你们需要一些变化。主要的想法是，如果第二个单词出现不止一次，就把它从行中删除

lastWord = None
for line in open('file.txt'):
  w = line.split(':::')
  thisWord = w[1]
  if lastWord==w[1]:
    del w[1]
  lastWord = thisWord
  print ':::'.join(w)