Are there copyright restrictions on the use of Python?
Not really. You can do anything you want with the source, as long as you leave the copyrights in and display those copyrights in any documentation about Python that you produce. If you honor the copyright rules, it’s OK to use Python for commercial use, to sell copies of Python in source or binary form (modified or unmodified), or to sell products that incorporate Python in some form. We would still like to know about commercial use of Python, of course.
See the PSF license page to find further explanations and a link to the full text of the license.
Also note that “Python” is a registered trademark of the PSF. If you want to use the trademark or the Python logotype, see the PSF trademark usage policy.