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Python Programming - Generators - Discussion

Discussion Forum : Generators - General Questions (Q.No. 77)
Generators
77.
How does the itertools.chain.from_iterable() function differ from itertools.chain() when used with generators?
They are equivalent in functionality
itertools.chain.from_iterable() flattens nested iterables produced by the generator, while itertools.chain() concatenates multiple generators
itertools.chain() flattens nested iterables produced by the generator, while itertools.chain.from_iterable() concatenates multiple generators
itertools.chain.from_iterable() raises a ValueError when used with generators
Answer: Option
Explanation:
itertools.chain.from_iterable() is designed to handle nested iterables, flattening them into a single sequence. itertools.chain() concatenates multiple generators into a single sequence. 
import itertools

nested_generator = ([1, 2, 3], [4, 5, 6], [7, 8, 9])
flattened_iterable = itertools.chain.from_iterable(nested_generator)
concatenated_iterable = itertools.chain(*nested_generator)

print(list(flattened_iterable))      # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(list(concatenated_iterable))   # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]
Discussion:
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