I really can't think of a case where the missing comma would make any sense at all.
That is pretty tricky, yes.The comma means it's a tuple. Without the comma, it's just a string with parenthesis around it, which is a string.
PyDev console: starting.
Python 3.9.15 (main, Oct 28 2022, 17:28:38) [GCC] on linux
x = ('%' + "2023-11" + '%')
x
'%2023-11%'
x = ('%' + x + '%',)
x
('%%2023-11%%',)
x.__class__.__name__
'tuple'
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