super(_open_file, self).__init__(open(name, mode)) PermissionError: [Errno 13] Permission denied: 'model/topo_based'

This error occurs when the Python code running on your system does not have permission to access the file "model/topo_based".

To fix this error, you can try the following solutions:

1. Check if the file exists in the specified path. If it doesn't exist, create the file with the correct permissions using the `os` module.

2. Check if the file is already open in another program. If it is, close the program and try running your code again.

3. Check the permission settings of the file and make sure that the Python code running on your system has permission to access the file.

4. Try running your Python code with administrative privileges.

5. If you are running your code on a network drive or in a shared folder, check if you have the necessary permissions to access the file.

6. If you are using a virtual environment, make sure that the file is located within the virtual environment and not outside it.