Excel file in use from Python

[Oshadha]

Without using filename = open(filename, 'w')

Try to use With:

with open(filename, 'w') as file:
    file.write('text')

This way you don't have to filename.close(). This way is more efficient and automatically closes the file if an error is raised.

Does the entire program need to go inside this with block, then, or would I just include this in those places I'm actually writing to the file?

All code that requires the file text wrapper (file variable).
Basically only when writing / reading the file.