Requirement:

[
{
"code": "AF",
"value": 53,
"name": "Afghanistan"
},
{
"code": "AL",
"value": 117,
"name": "Albania"
},
{
"code": "DZ",
"value": 15,
"name": "Algeria"
},
{
"code": "AD",
"value": 181,
"name": "Andorra"
},
{
"code": "AO",
"value": 15,
"name": "Angola"
}
]

将value后面的数字全部变成0 （即以value作为标志）

import re


subject = '''
[
{
"code": "AF",
"value": 53,
"name": "Afghanistan"
},
{
"code": "AL",
"value": 117,
"name": "Albania"
},
{
"code": "DZ",
"value": 15,
"name": "Algeria"
},
{
"code": "AD",
"value": 181,
"name": "Andorra"
},
{
"code": "AO",
"value": 15,
"name": "Angola"
}
]'''


innerre = re.compile("\d+")


def replacewithin(matchobj):
    return innerre.sub("0", matchobj.group())


result = re.sub('"value": .*', replacewithin, subject)
print result