如何将默认值dict字符串转换为实际dict

Question

I am trying to convert the following string to a dict:

"{'key1': 0, 'key2': defaultdict(<class 'int'>, {'total': 9, 'semcor': 9})}"

I tried using literal_eval from ast and also json.loads from json, however none of them can convert it. For JSON I understand that it does not have the json structure, however I don't fully understand why literal_eval doesn't work.

Can someone tell me if it is possible to do so?

Answer 1

A quick and dirty way to parse it is to replace the <class 'int'> notation with the actual class name, and then eval the string:

from collections import defaultdict
import re
s = '''"{'key1': 0, 'key2': defaultdict(<class 'int'>, {'total': 9, 'semcor': 9})}"'''
eval(re.sub(r"<class '(\w+)'>", r'\1', s))

This returns:

{'key1': 0, 'key2': defaultdict(int, {'total': 9, 'semcor': 9})}