用zip根据字典键排序

```py
dic = {"name":"zs","sex":"man","city":"bj"}
foo = zip(dic.keys(),dic.values())
foo = [i for i in foo]
print("字典转成列表嵌套元组",foo)
b = sorted(foo,key= lambda x:x[0])
print("根据键排序",b)
new_dic = {i[0]:i[1] for i in b}
print("字典推导式构造新字典",new_dic)

// 输出结果
字典转成列表嵌套元组 [('name', 'zs'), ('sex', 'man'), ('city', 'bj')]
根据键排序 [('city', 'bj'), ('name', 'zs'), ('sex', 'man')]
字典推导式构造新字典 {'city': 'bj', 'name': 'zs', 'sex': 'man'}

```

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