How to override FOR IN loop list behavior?

Question

I try to implement list which returns wrapped elements when accessing directly (by index) or via FOR IN loop statement. At present I have following code:

class ItemWrappedList(list):

    def __getitem__(self, y):
        result = super().__getitem__(y)
        return f'<item>{result}</item>'


lst = ItemWrappedList(['1', '2', '3'])

for pos in range(len(lst)):
    print(lst[pos])

#>>> <item>1</item>
#>>> <item>2</item>
#>>> <item>3</item>

for value in lst:
    print(value)
#>>> 1
#>>> 2
#>>> 3

As you can see first loop works correctly, as intended. But second loop calls list methods that I was unable to override. Are there any possibilities to force ItemWrappedList class to have same behavior in all situations?

P.S. I tried different ways with implementing/overriding __next__ and __iter__ methods, but seems that __next__ ever not called.

Answer 1

Overriding the __iter__ method should do the trick:

class ItemWrappedList(list):

    def __getitem__(self, y):
        result = super().__getitem__(y)
        return f'<item>{result}</item>'

    def __iter__(self):
        return (f'<item>{x}</item>' for x in list.__iter__(self))


lst = ItemWrappedList(['1', '2', '3'])

for pos in range(len(lst)):
    print(lst[pos])


for value in lst:
    print(value)

<item>1</item>
<item>2</item>
<item>3</item>
<item>1</item>
<item>2</item>
<item>3</item>