字典是键值对的数据类型,key不可以重复，必须是不可变类型，可hash， 字典是无序的。
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info = {
‘name1’:'tt',
‘nmae2’:'ttt'
‘david’：[24,'beijing'],
}
info['david']
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增加
获取
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#没有返回None
info.get('stu1')
#没有报错
info['stu1']
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删除
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info.pop('stu1')
#随机删除
info.popitem()
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多级字典嵌套
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zoo = {
"爬行馆":{"a1":"lizard"},
}
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获取键
获取值
获取items
创建字典fromkeys
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info.fromkeys(['A','B','C'])
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更新字典
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dic2 = {"k1": "v1111", "a": "b"}
dic2.update({"k1": "v1111", "a": "b", "k3": "v3"})
print("Value : %s" % dic2)
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字典循环
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#高效
for k in info:
print(k,info[k])
#低效
for k,v in info.items():
print(k,v)
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