>>> forest = ['cedar', 'bamboo', 'cedar', 'cedar', 'cedar', 'oak', 'bamboo']
>>> tree_types = set(forest...)
>>> tree_types
{'bamboo', 'oak', 'cedar'} # Only unique items
>>> 'oak' in tree_types
True
>>>...tree_types.remove('oak') # Sets are also mutable
>>> tree_types
{'bamboo', 'cedar'}
frozenset 与集合相同...>>> forest = ['cedar', 'bamboo', 'cedar', 'cedar', 'cedar', 'oak', 'bamboo']
>>> tree_types = frozenset...(forest)
>>> tree_types
frozenset({'bamboo', 'oak', 'cedar'})
>>> 'cedar' in tree_types
True
>>> tree_types.add
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