Which function can be used to iterate over several iterables and combine an item from each one to produce an iterator of tuples in Python?

The function that can be used to iterate over several iterables and combine an item from each one to produce an iterator of tuples is the zip() function.

Here is a step by step guide on how to use it:

1. Define your iterables. These can be lists, tuples, sets, etc. For example:

list1 = [1, 2, 3]
list2 = ['a', 'b', 'c']

2. Use the zip() function to combine these iterables. The zip() function returns a zip object, which is an iterator of tuples.

result = zip(list1, list2)

3. The zip object can be converted to a list, tuple, or set, allowing you to use the combined data as you would with any other iterable.

result_list = list(result)

4. result_list now contains tuples, where the i-th tuple contains the i-th element from each of the argument sequences or iterables.

print(result_list)

This will output: [(1, 'a'), (2, 'b'), (3, 'c')]

Remember, the iterator stops when the shortest input iterable is exhausted. If the iterables are of uneven length, elements of the longer iterables are simply ignored past that point.