What types of objects in programming do not implement the iterator interface?

In Python, objects that do not implement the iterator interface are those that lack the __iter__() and __next__() methods.

For example, simple data types such as:

• Integers (int)
• Floating-point numbers (float)
• Boolean values (bool)
• None type objects

These objects are not iterable and cannot be used directly in for loops.

In contrast, collections (lists, tuples, sets, dictionaries, strings) implement the __iter__() method and are iterable.

Example check:

x = 10
try:
    iter(x)
except TypeError:
    print("Object is not iterable")

The output will be: Object is not iterable.