This is a valid use case:
exceptions = (ZeroDivisionError, OverflowError)
try:
foo = 1/0
except exceptions:
foo = 0
Sonar flags this with python:S5708.
The reason we might want to put the tuple of exceptions in a variable is that we could have multiple try/except blocks catching the same error classes or simply as a way to make the code more readable without splitting the except line.