Convert python dict to json dict

#!/usr/bin/env python3
'''
Run the script, then paste a "python-like" dictionary as input and press enter.
The script will output the json parseable version of the input.
'''
import json
import ast


def transform(obj):
    if isinstance(obj, ast.Module):
        assert(len(obj.body) == 1)  # for converting to json-like
        return transform(obj.body[0])
    elif isinstance(obj, ast.Expr):
        return transform(obj.value)
    elif isinstance(obj, ast.Dict):
        keys = [transform(_) for _ in obj.keys]
        vals = [transform(_) for _ in obj.values]
        return dict(zip(keys, vals))
    elif isinstance(obj, ast.List):
        return [transform(_) for _ in obj.elts]
    elif isinstance(obj, ast.Constant):
        return obj.value
    else:
        raise Exception('TODO')


src = ''
while True:
    inpt = input()
    if inpt == '':
        break
    src += inpt

parsed = ast.parse(src)
converted = transform(parsed)
print('\nResult:')
print(json.dumps(converted, indent=2))