module 'chain' has no attribute 'from_iterable'

This error message is raised when the program tries to access the `from_iterable` attribute of the `chain` module, but such attribute does not exist.

The `from_iterable` method is a function provided by the `itertools` module, which can be used to flatten an iterable of iterables into a single iterable. It is often used in combination with the `chain` function to concatenate multiple iterables into a single one.

To fix this error, you should import the `itertools` module and use its `from_iterable` function instead of trying to access it from the `chain` module:

import itertools

# Example usage of chain and from_iterable
iterables = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
flattened = itertools.chain.from_iterable(iterables)
print(list(flattened))  # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]