If you don't like the idea of 'adding' strings you can 'concat'enate:
>>> items = [[1,2,3], [4,5], [6]]
>>> functools.reduce(operator.concat, items)
[1, 2, 3, 4, 5, 6]
>>> functools.reduce(operator.iconcat, items, [])
[1, 2, 3, 4, 5, 6]
The latter is the functional way to spell your for... extend() loop.
Don't forget to provide the initial value in that case lest you modify
the input:
>> functools.reduce(operator.iconcat, items) # wrong
[1, 2, 3, 4, 5, 6]
>>> items
[[1, 2, 3, 4, 5, 6], [4, 5], [6]] # oops
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====
Was also thinking about reduce, though this one uses a dunder method:
from functools import reduce
d = {1: ['aaa', 'bbb', 'ccc'], 2: ['fff', 'ggg']}
print(reduce(list.__add__, list(d.values())))
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