<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def data_from_file(self, file, apple_fix=False):
 """ Read iCal data from file. :param file: file to read :param apple_fix: fix wrong Apple tzdata in iCal :return: decoded (and fixed) iCal data """

        with open(file, mode='rb') as f:
            content = f.read()

        if not content:
            raise IOError("File %f is not readable or is empty!" % file)

        return self.decode(content, apple_fix=apple_fix)