código para extrair contagem de staments de json

json_statements.py

from collections import defaultdict
import json

json_str = '''[{ "metodo": "metodo1()", "statements": 134},
{ "metodo": "metodo2()", "statements": 124},
{ "metodo": "metodo3()", "statements": 110},
{ "metodo": "metodo3()", "statements": 228},
{ "metodo": "metodo4()", "statements": 50}]'''

lst = json.loads(json_str)

counter_dct = defaultdict(lambda: 0)

for dct in lst:
    key = dct['metodo']
    value = dct['statements']
    counter_dct[key] += value

print(counter_dct)