1.2 KiB
1.2 KiB
Python 字典的基本用法
原文：https://www.pythonforbeginners.com/dictionary/python-dictionary-basic-usage
Dictionary 是 Python 中的另一种数据类型。
字典概述
A dictionary maps a set of key to a set of values.
Dictionaries in Python are also known as hash tables.
It requires that the keys are unique (within one dictionary), while the values maynot.
The values of a dictionary can be of any type, but the keys must be of an
immutable data type such as strings, numbers, or tuples.
Dictionaries are like lists mutable
A dictionary is created with a pair of braces {}.
For example, dic = {} creates an empty dictionary.
Each key is separated from its value by a colon (:)
Placing a comma-separated list of key:value pairs within the braces adds initial
key:value pairs to the dictionary; this is also the way dictionaries are written
on output.
The main operations on a dictionary are storing a value with some key and
extracting the value given the key.
If you store using a key that is already in use, the old value associated with
that key is forgotten.
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