python基本数据类型(元组)

Posted 2020-10-02

#! /usr/bin/env python
#! -*- cording:utf-8 -*-

li=[11,22,33]
new_dict=dict(enumerate(li,10))#加一个序号，是10
print(new_dict)

dic={"k1":123,"k2":456,"k4":111}
#dic.get()
#k1k2默认值123
n=dic.fromkeys([‘k1‘,‘k2‘,‘k3‘],‘alex‘)
#更新values值
print(n)
n2={‘k1‘:[],‘k2‘:[],‘k3‘:[]}
print(n2)

n2[‘k1‘].append(‘x‘)
print(n2)

#在每个元素里都加了x，用fromkeys去创建k1k2k3时共同创建了一个列表。一旦更新k1就会都更新
n3=dict.fromkeys([‘k1‘,‘k2‘,‘k3‘],[])
print(n3)
n3[‘k1‘].append(‘x‘)
print(n3)