Python 字典

面向 MATLAB 用户的 Python

Justin Kiggins

Product Manager

什么是字典？

类似 MATLAB 的结构体数组
键:值对的集合
不保证有序

从字典中取数

type(definitions)

dict

print(definitions['aardvark'])

A nocturnal burrowing mammal with long ears, a tubular snout, and a long 
extensible tongue, feeding on ants and termites. Aardvarks are native to 
Africa and have no close relatives.

创建字典

# 创建字典
dog = {'name': 'Toby', 'breed': 'Basset Hound'}

向字典添加数据

# 添加更多键:值
dog['weight (lbs)'] = 552.3
dog['birthdate'] = "2016-06-26"
print(dog)

{'name': 'Toby',
 'breed': 'Basset Hound',
 'weight (lbs)': 552.3, 
 'birthdate': '2016-06-26'}

更新字典

# 更新体重值
dog['weight (lbs)'] = 52.3

print(dog)

{'name': 'Toby',
 'breed': 'Basset Hound',
 'weight (lbs)': 52.3,
 'birthdate': '2016-06-26'}

从字典中删除数据

dog.pop('birthdate')
print(dog)

{'name': 'Toby',
 'breed': 'Basset Hound',
 'weight (lbs)': 52.3}

开始练习！

面向 MATLAB 用户的 Python