##### dict.fromkeys() - `dict.fromkeys(iterable[, value])` - 字典类方法, 使用来自 iterable 的键创建一个新字典，并将键值设为 value ```python dict.fromkeys([1,2,3],[1,2,3]) # {1: [1, 2, 3], 2: [1, 2, 3], 3: [1, 2, 3]} dict.fromkeys([1,2,3],1) # {1: 1, 2: 1, 3: 1} ```