def string_to_dict(raw_data):
    items = raw_data.split(",")
    result = {}
    for item in items:
        key, value = item.split(":")
        result[key] = value
    return result


raw_data = "id:101,name:python,level:gold"
ret = string_to_dict(raw_data)
print(ret)  # {'id': '101', 'name': 'python', 'level': 'gold'}