dict split in https://www.v2ex.com/t/133087

dict_split.py

d = {
"A0801_000000_201301": "1,321.8", 
"A0801_000000_201302": "1,199.8", 
"A0801_000000_201309": "1,433.4", 
"A0802_000000_201305": "6,688.3", 
"A0802_000000_201306": "8,085.2", 
"A0802_000000_201307": "9,481.0", 
"A0802_000000_201308": "10,878.4", 
"A0802_000000_201309": "12,311.8", 
"A0802_000000_201310": "13,739.9", 
}

new_d = {}
for k in d:
    key, mid, subkey = k.split('_')
    new_d.setdefault(key, {})[subkey] = d[k]

print new_d
#result
"""
{
    'A0801': {
       '201309': '1,433.4', 
       '201302': '1,199.8',
       '201301': '1,321.8'
    }, 
    'A0802': {
        '201310': '13,739.9', 
        '201308': '10,878.4', 
        '201309': '12,311.8', 
        '201305': '6,688.3', 
        '201306': '8,085.2', 
        '201307': '9,481.0'
    },
}
"""