python字典——映射

#1、添加键值

>>> D

{}

>>> D['name'] = 'tom'

>>> D

{'name': 'tom'}

>>> D['job'] = 'phper'

>>> D['age'] = 10

>>> D

{'age': 10, 'job': 'phper', 'name': 'tom'}

#2、直接赋值

>>> D = {'food':'spam','quantity':4,'color':'pink'}

>>> D

{'quantity': 4, 'food': 'spam', 'color': 'pink'}

>>> D['food']

'spam'

>>> D['quantity']

4

>>> D["quantity"] +=2

>>> D

{'quantity': 6, 'food': 'spam', 'color': 'pink'}