Python 字典操作

# Dict

#当值一样时，批量创建键
dic_1 = dict.fromkeys(['host1', 'host2', 'host3'], 'test')
print(dic_1)


#字典排序
dic_2 = {'c':555, 'b':333, 'a':111}
sorted(dic_2)
sorted((dic_2.values()))
print(sorted(dic_2))
print(sorted((dic_2.values())))


#字典遍历
dic = {'name':'mu', 'age':'24'}

for i in dic:
    print(i)

for i in dic.values():
    print(i)

for i in dic:
    print(i,dic[i])                       # 推荐用这种，速度快，直接打印

for i in dic.items():
    print(i)

for i, v in dic.items():              # 数据需要转换，用这种方式，耗内存，并且时间长
    print(i, v)