字典:
字典是”键值对“的无序可变序列,字典的每个元素都是一个”键值对“
a={'name':'gaoqi',‘age':18,'job':'programmer'}
dict(name='gaoqi',age='18')
dict([("name","gaoqi"),("age",18)])
k=['name','age','job']
v=['gaoqi',18,'teacher']
d=dict(zip(k,v))
通过fromkeys创建值为空的字典
a=dict.fromkeys(['name','age','job'])