My thoughts on Git, in other word, vision control, we can have a roll back.

git diff 
#handy to see the uncommited change, appending update. green is added while red is deleted.
git checkout -- .
##so we can roll back with this command

Some ideas for Error Checking

We can assure valid CLI arguments and check File I/O. error-checking

#pre error-checking
if len(sys.argv) != 2:
    print(f"usage: python {sys.argv[0]} <file_to_uplaod>")
    sys.exit(1)
if not os.path.isfile(sys.argv[1]):
    print(f"error: file '{sys.argv[1]}' not found")
    sys.exit(2)     
main(sys.argv)

Beautification with Formatters. We need eliminate “snowflake” code and make sure inter-project consistency.

Demostration

black filesafe_netmiko.py

Bug checking with Linters. We can use it to find syntax and styling issues.