How to delegate `iter` method in Python

Question

I would like to delegate __iter__ method for an iterable container.

class DelegateIterator:
    def __init__(self, container):
        attribute = "__iter__"
        method = getattr(container, attribute)
        setattr(self, attribute, method)

d = DelegateIterator([1,2,3])
for i in d.__iter__(): # this is successful
    print(i)
for i in d: # raise error
    print(i)

The output is

1
2
3
Traceback (most recent call last):
  File "test.py", line 10, in <module>
    for i in d:
TypeError: 'DelegateIterator' object is not iterable

Please let me know how to delegate __iter__ method.

__iter__ does now work when defined as an instance variable stackoverflow.com/questions/43346584/… — cuzic
– cuzic, Commented Mar 31, 2021 at 7:32

orlp · Accepted Answer · 2021-03-01 05:47:04Z

5

Why overcomplicate things?

class DelegateIterator:
    def __init__(self, container):
        self.container = container

    def __iter__(self):
        return iter(self.container)

answered Mar 1, 2021 at 5:47

orlp

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