foo_tuple = (1, 2, 3) foo_list = [1, 2, 3] foo_set = {1, 2, 3} foo_dict = {1: 2, 3: 4} foo_int = 123 for i in list(foo_tuple): # PERF101 pass for i in list(foo_list): # PERF101 pass for i in list(foo_set): # PERF101 pass for i in list((1, 2, 3)): # PERF101 pass for i in list([1, 2, 3]): # PERF101 pass for i in list({1, 2, 3}): # PERF101 pass for i in list( { 1, 2, 3, } ): pass for i in list( # Comment {1, 2, 3} ): # PERF101 pass for i in list(foo_dict): # OK pass for i in list(1): # OK pass for i in list(foo_int): # OK pass import itertools for i in itertools.product(foo_int): # OK pass for i in list(foo_list): # OK foo_list.append(i + 1) for i in list(foo_list): # PERF101 # Make sure we match the correct list other_list.append(i + 1) for i in list(foo_tuple): # OK foo_tuple.append(i + 1) for i in list(foo_set): # OK foo_set.append(i + 1) x, y, nested_tuple = (1, 2, (3, 4, 5)) for i in list(nested_tuple): # PERF101 pass for i in list(foo_list): # OK if True: foo_list.append(i + 1) for i in list(foo_list): # OK if True: foo_list[i] = i + 1 for i in list(foo_list): # OK if True: del foo_list[i + 1] import builtins for i in builtins.list(nested_tuple): # PERF101 pass # https://github.com/astral-sh/ruff/issues/18783 items = (1, 2, 3) for i in(list)(items): print(i) # https://github.com/astral-sh/ruff/issues/18784 items = (1, 2, 3) for i in ( # 1 list # 2 # 3 )( # 4 items # 5 # 6 ): print(i)