How to Fix Iterator Errors

In this tutorial, you'll learn about How to Fix Iterator Errors. We cover key concepts, practical examples, and best practices.

Fix iterator errors when custom collection exposes internal structure or can't be traversed uniformly.

Quick Fix

Wrong

class Node:
    def __init__(self,v): self.v=v; self.n=None
class LinkedList:
    def __init__(self): self.h=None
    def get_all(self):
        res=[]; cur=self.h
        while cur: res.append(cur.v); cur=cur.n
        return res

Returns list copy. Can't traverse lazily for large lists. Collection exposes Node type.

Right

class LinkedList:
    def __init__(self): self.h=None
    def __iter__(self):
        cur=self.h
        while cur: yield cur.v; cur=cur.n
ll=LinkedList()
for v in ll: print(v)

Generator-based iterator. Lazy traversal. Works with for loops, list comprehensions, next().

Prevention

Iterator pattern provides way to access elements sequentially without exposing underlying representation.

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