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Zip

The zip function takes two iterables (often lists), and returns a new iterable where each element is a tuple containing one element from each of the original iterables.

a: list[int] = [1, 2, 3]
b: list[int] = [4, 5, 6]

c: list[tuple[int, int]] = list(zip(a, b))
print(c)
# [(1, 4), (2, 5), (3, 6)]

Assignment

Complete the pair_document_with_format function. It takes two lists of strings as input:

doc_names: the names of documents
doc_formats: the file formats of the documents

zip up the lists into a single list of tuples, with the name as the first index and the format as the second index in each tuple.
filter the list of tuples to include only tuples where the format is one of the given valid_formats.
Return the result as a list.