modified-iterating-list / W4701#
Iterated list '%s' is being modified inside for loop body, consider iterating through a copy of it instead.
Emitted when items are added or removed to a list being iterated through. Doing so can result in unexpected behaviour, that is why it is preferred to use a copy of the list.
fruits = ["apple", "orange", "mango"] for fruit in fruits: fruits.append("pineapple") # [modified-iterating-list]
fruits = ["apple", "orange", "mango"] for fruit in fruits.copy(): fruits.append("pineapple")
Created by the modified_iteration checker.