Mark Sapiro <m...@msapiro.net> added the comment:

Thank you for the explanation which I understand and accept. I also fully (or 
maybe not quite fully) understand the use of square brackets to indicate 
optional arguments. It's just that in the context of the table at 
https://docs.python.org/3/library/stdtypes.html#mutable-sequence-types every 
other use of square brackets indicates a list or a slice and that's what 
confused me. Granted, all the other square bracket usage was not around a 
method argument, and I accept that the doc is correct, but I still found it 
confusing.

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<https://bugs.python.org/issue43996>
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