Question

I’ve generated the cartesian product of three dicts thus:

import itertools
combined = list(itertools.product(foo, bar, baz))

So my list now looks like:

[(('text a', 'value a'), ('text b', 'value b'), ('text c', 'value c')), … ]

What I want to do is unpack this list such that I end up with a list of lists containing the flattened nested tuples’ text and values:

[['text a text b text c', 'value a value b value c'], … ]

Is there an efficient general method for doing this?

Follow-up (having seen Dan D.’s answer):

What if my tuples looked like

(('text a', float a), ('text b', float b), ('text c', float c ))

and I wanted to add the floats instead of concatenating the values?

Answer 1

You don’t have to cram everything on one line:

def combine(items):
    for tuples in items:
        text, numbers = zip(*tuples)
        yield ' '.join(text), sum(numbers)

print list(combine(product( ... )))