5
### Bugs
- No explicit code functionality is given, so no bugs are currently identifiable.
- The classes do not include any methods, attributes, or detailed documentation.
### Optimizations
- Add docstrings to explain the purpose of each class and how they should be used.
- Implement methods or attributes, if applicable, to provide functionality related to parsing and checksum validation.
- Consider leveraging built-in exception-handling features in Python to reduce code maintenance.
### Good points
- The use of custom exception classes (`ParseError` and `InvalidChecksumError`) is a good practice for handling specific errors.
- Both classes inherit from Python's `Exception` class, which is a correct use of inheritance for error handling.
### Summary
The code defines two custom exception classes for handling parse errors and invalid checksum errors, but there is no additional functionality provided. It serves as a basic template for extending error handling in a larger application. To improve it, consider expanding on its functionality and documentation for clarity and usability.
### Open source alternatives
- [pyparsing](https://github.com/pyparsing/pyparsing): A general parsing module for creating and executing parsers.
- [lxml](https://github.com/lxml/lxml): Useful for XML parsing which inherently deals with checksum and parse validation.