logging level with debug always failed with AttributeError: 'list' object has no attribute 'isalnum'

Describe the bug

When setting logging level to debug, each send message will gives above error. It is later found out that

From the can/Message.py line 143, -->if (self.data is not None) and (self.data.isalnum()):

Message.data is a list not a string, therefore above check on second part where it is checking self.data.isalnum() will gives error of AttributeError: 'list' object has no attribute 'isalnum'.

To Reproduce

enable logging set logging level to debug. then try to send a can message and observe the error.

Expected behavior

Additional context

OS and version: window 10 Python version: 3.10 python-can version: python-can interface/s (if applicable):

Traceback and logs

```python def __str__(self) -> str: field_strings = [f"Timestamp: {self.timestamp:>15.6f}"] if self.is_extended_id: arbitration_id_string = f"ID: {self.arbitration_id:08x}" else: arbitration_id_string = f"ID: {self.arbitration_id:04x}" field_strings.append(arbitration_id_string.rjust(12, " ")) flag_string = " ".join( [ "X" if self.is_extended_id else "S", "Rx" if self.is_rx else "Tx", "E" if self.is_error_frame else " ", "R" if self.is_remote_frame else " ", "F" if self.is_fd else " ", "BS" if self.bitrate_switch else " ", "EI" if self.error_state_indicator else " ", ] ) field_strings.append(flag_string) field_strings.append(f"DL: {self.dlc:2d}") data_strings = [] if self.data is not None: for index in range(0, min(self.dlc, len(self.data))): data_strings.append(f"{self.data[index]:02x}") if data_strings: # if not empty field_strings.append(" ".join(data_strings).ljust(24, " ")) else: field_strings.append(" " * 24) if (self.data is not None) and (self.data.isalnum()): <=================== here field_strings.append(f"'{self.data.decode('utf-8', 'replace')}'") if self.channel is not None: try: field_strings.append(f"Channel: {self.channel}") except UnicodeEncodeError: pass return " ".join(field_strings).strip() ```

hardbyte / python-can