mailbox.py 文件源码

def get_bytes(self, key):
        """Return a bytes representation or raise a KeyError."""
        try:
            if self._locked:
                f = open(os.path.join(self._path, str(key)), 'rb+')
            else:
                f = open(os.path.join(self._path, str(key)), 'rb')
        except IOError as e:
            if e.errno == errno.ENOENT:
                raise KeyError('No message with key: %s' % key)
            else:
                raise
        try:
            if self._locked:
                _lock_file(f)
            try:
                return f.read().replace(linesep, b'\n')
            finally:
                if self._locked:
                    _unlock_file(f)
        finally:
            f.close()