text = r'({"d":"{"events":{"keys":["time","room","groups","teacher","name","comment","class"],"values":[[1513593000,[71],[1308],9713,"Архитектура вычислительных систем","","normal"],[1513599300,[71],[1308],15653,"Высшая математика","","normal"],[1513673100,[71],[1308],15728,"Охрана труда, гражданская оборона и охрана окружающей среды","","normal"],[1513679400,[74],[1308],15651,"Иностранный язык","","normal"]]}}"})'

import json
data = json.loads(text[1:-1])
print(data)

url = 'http://services.tsi.lv/schedule/api/service.asmx/GetLocalizedEvents?from=1513548000&to=1513734400&teachers=&rooms=&groups=1308&lang=%27ru%27'

import requests
rs = requests.get(url)
text = rs.text

import json
data = json.loads(text[1:-1])
print(data)

text = r'({"d":"{"events":{"keys":["time","room","groups","teacher","name","comment","class"],"values":[[1513593000,[71],[1308],9713,"Архитектура вычислительных систем","","normal"],[1513599300,[71],[1308],15653,"Высшая математика","","normal"],[1513673100,[71],[1308],15728,"Охрана труда, гражданская оборона и охрана окружающей среды","","normal"],[1513679400,[74],[1308],15651,"Иностранный язык","","normal"]]}}"})'

import ast
data = ast.literal_eval(text)
print(data)