import os

APP_ROOT = os.path.dirname(os.path.abspath(__file__))
DAO_ROOT = os.path.join(APP_ROOT, 'dao')
DATA_ROOT = os.path.join(APP_ROOT, 'data')
CHINA_HISTORY_ROOT = os.path.join(DATA_ROOT, 'china_history')
PARAMS_ROOT = os.path.join(DATA_ROOT, 'params')
WORLD_HISTORY = os.path.join(DATA_ROOT, 'world_history')
STU_HISTORY = os.path.join(DATA_ROOT, 'stu_data')

MAX_USERNAME_LENGTH = 50
MIN_USERNAME_LENGTH = 3
MAX_PASSWORD_LENGTH = 30
MIN_PASSWORD_LENGTH = 4

SHIFT_OF_DATE = 500
FORECAST_DATES = 30