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- try:
- from collections import MutableSequence
- except ImportError:
- from backport_collections import MutableSequence
- class UniqueSequence(MutableSequence):
- def __init__(self):
- self.data = []
- def __contains__(self, item):
- return item in self.data
- def __iter__(self):
- return iter(self.data)
- def __getitem__(self, item):
- return self.data[item]
- def __setitem__(self, key, value):
- self.data[key] = value
- def __delitem__(self, key):
- del self.data[key]
- def __len__(self):
- return len(self.data)
- def insert(self, index, value):
- if value not in self:
- self.data.insert(index, value)
|
