Best Practices for a Python Command Line Interface [on hold]

I will build a Command Line Interface that browses all the files in a folder and extracts specific information, the output will be saved on a file. It would run on a command similar to this

myapp --path="/folder/subfolder" --except="subfolder2" --extensions=".py"

I have done CLI a couple of times but for casual projects. I wish that this time I could be more professional and use as many best practices as possible.

I've been researching and I've found two ways to do it:

Using Libraries as:

• Click
• Docopt

Using Design Patterns:

• Command Pattern
• Facade Pattern

I would like to know based on your experiences, what would be the best option? Thanks in advance