Python: Grammatically correct human readable string from list (with Oxford comma)

I want a grammatically correct human-readable string representation of a list. For example, the list ['A', 2, None, 'B,B', 'C,C,C'] should return the string A, 2, None, B,B, and C,C,C. This contrived example is somewhat necessary. Note that the Oxford comma is relevant for this question.

I tried ', '.join(seq) but this doesn't produce the expected result for the aforementioned example.

Note the preexisting similar questions:

• How to print a list in Python "nicely" doesn't concern with a grammatically correct human-readable string.
• Grammatical List Join in Python is without the Oxford comma. The example and answers there are correspondingly different and they do not work for my question.

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