In Python 3 you could also use a dict comprehension, ... and you want this (each element of the list keying a given value (2 in this case)): ... <看更多>

list 是一种有序的集合，可以随时添加和删除其中的元素。 ... dict全称dictionary，在其他语言中也称为map，使用键-值（key-value）存储，具有极快的 ... ... <看更多>

The builtins data structures are: lists, tuples, dictionaries, ... Python Tutorial : Data Structures (list, dict ... ... <看更多>

Python basic list/dict operations. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

The only possible improvement I see is to avoid unnecessary dictionary lookups by iterating over key-value pairs: ids = list() first_names = set() ... ... <看更多>