Python () vs [] vs {} 之间有什么区别？
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What's the difference between () vs [] vs {}?
提问by Zolomon
What's the difference between () vs [] vs {} in Python?
They're collections? How can I tell when to use which?
Python 中的 () 与 [] 与 {} 之间有什么区别？
他们是收藏品？我怎么知道什么时候使用哪个？
采纳答案by Greg Hewgill
() - tuple
() - 元组
A tuple is a sequence of items that can't be changed (immutable).
元组是一系列无法更改（不可变）的项目。
[] - list
[] - 列表
A list is a sequence of items that can be changed (mutable).
列表是可以更改（可变）的项目序列。
{} - dictionary or set
{} - 字典或集合
A dictionary is a list of key-value pairs, with unique keys (mutable). From Python 2.7/3.1, {}can also represent a set of unique values (mutable).
字典是键值对列表，具有唯一键（可变）。从 Python 2.7/3.1 开始，{}也可以表示一组唯一值（可变）。
回答by Mark Byers
- () is a tuple: An immutable collection of values, usually (but not necessarily) of different types.
- [] is a list: A mutable collection of values, usually (but not necessarily) of the same type.
- {} is a dict: Use a dictionary for key value pairs.
- () 是一个元组：一个不可变的值集合，通常（但不一定）是不同类型的。
- [] 是一个列表：一个可变的值集合，通常（但不一定）是相同类型的。
- {} 是一个字典：对键值对使用字典。
For the difference between lists and tuples see here. See also:
有关列表和元组之间的区别，请参见此处。也可以看看：
回答by user225312
回答by Andrew Jaffe
In addition to the tuple, list and dict given by the other answers, {}also denotes a set literal in python 2.7 and python 3.1. (This makes sense because set elements act like the keys of a dict).
除了其他答案给出的元组，列表和字典之外，{}还表示python 2.7和python 3.1中的集合文字。（这是有道理的，因为 set 元素就像字典的键一样）。
