python/testData/inspections/PyStringFormatInspection/NewStyleMappingKeyWithSubscriptionRefArgs.py

list = [1, 2, 3]
"{foo[1]}".format(foo=list)
"{foo[3]}".format(foo=list)

tuple = (1, 2, 3)
"{foo[1]}".format(foo=tuple)
"{foo[3]}".format(foo=tuple)