Final answer:
Python predefines iterators for data structures like lists, dictionaries, sets, and tuples. These iterators can be used implicitly in a for loop or called explicitly using the iterator's next method.
Step-by-step explanation:
The language that predefines iterators for iteration over its data structures is Python. In Python, these predefined iterators are an integral part of the language's design and are provided for various data structures like lists, dictionaries, sets, and tuples. One can use the for loop to iterate over these structures, or call the iterator's next method explicitly to retrieve elements one by one.
For example, a list in Python can be iterated over like this:
my_list = [1, 2, 3]
for item in my_list:
print(item)
Alternatively, one could explicitly call the iterator like this:
my_list = [1, 2, 3]
my_list_iterator = iter(my_list)
print(next(my_list_iterator)) # Outputs: 1
print(next(my_list_iterator)) # Outputs: 2