How can I flatten a list of lists in Python using iterators?

How can I flatten a list of lists in Python using iterators?

You can use the itertools.chain function to flatten a list of lists. Here's an example:

import itertools
nested_list = [[1, 2, 3], [4, 5], [6]]
flattened_list = list(itertools.chain.from_iterable(nested_list))
print(flattened_list)  # Output: [1, 2, 3, 4, 5, 6]

What if I have a list with different types of elements?

The itertools.chain method works regardless of the types of elements in the sublists. It will flatten them all into a single list.

Can you show me an example with mixed data types?

Sure! Here's an example:

nested_list = [[1, 'a', 3.5], [True, None], ['b', 2]]
flattened_list = list(itertools.chain.from_iterable(nested_list))
print(flattened_list)  # Output: [1, 'a', 3.5, True, None, 'b', 2]

Are there any performance considerations when flattening large lists?

Yes, using itertools.chain is generally more memory efficient than list comprehensions for large lists, as it generates items on-the-fly.