def _update_sheets(self):
    self._sheets.clear()
    sheets = pd.read_excel(self._path, None)
    for (key, val) in sheets.items():
        if (key[:2] == '20'):
            sheets[key] = process_daily(val)
    self._sheets.update(sheets)
def _update_sheets(self):
    self._sheets.clear()
    sheets = pd.read_excel(self._path, None)
    for (key, val) in sheets.items():
        if (key[:2] == '20'):
            sheets[key] = process_daily(val)
    self._sheets.update(sheets)