If you load a Python Script from a CD from your book into your text editor, it is then impossible to simply click save button in the text editor to save over that script. The reason for this is the fact that you are trying to save to a read only CD/DVD and this is an impossible task.
Yes its true there are read write CDs/DVDs but once a CD/DVD is fixed so that it runs on every computer and OS then it is no longer Read Write this is even true for Read Write CDs/DVDs. Manufactures of books commercial software always have their CDs/DVDs fixed so that they can distribute them to work on as many computers as possible.
So rather you have to save to your hard drive, thumb drive, USB Hard Drive with the File->Save As.
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