#1、添加鍵值
>>> D
{}
>>> D['name'] = 'tom'
>>> D
{'name': 'tom'}
>>> D['job'] = 'phper'
>>> D['age'] = 10
>>> D
{'age': 10, 'job': 'phper', 'name': 'tom'}
#2、直接賦值
>>> 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'}