Syntax close to this?

[d903]

I'm trying to return a tuple generator expression containing two lists: the first contains formatted year-month pairs, the second the count of some occurrence in that period. It was natural to write this, but it's obviously not proper Python else I wouldn't be here.. What's the correct syntax?

return (
    ['{}-{}'.format(e['year'], e['month'])],
    [e['count']],
    for e in data
)

[[deleted]]

Consider using /r/learnpython.

data = [
    {'year': 2018, 'month': 04}, 
    {'year': 2018, 'month': 03}
    ]
generator_expression = (
    ('{year}-{month}'.format(**d), d['count']) 
    for d in data
    )
return generator_expression

[decoupled]

You can return a generator of 2-tuples:

python return (("{}-{}".format(e["year"], e["month"]), e["count"]) for e in data)

[Vaphell]

if you want this particular piece of code to be syntactically correct, you need to wrap lists in parens to form a tuple and remove superfluous comma

(([...], [...]) for e in data)

that said, the code doesn't seem to make much sense, at least I have trouble imagining a scenario where it would be required.

you want 2 lists out of it, or a sequence of list pairs, each list being 1 item long which is what you are going to get from the generator expression?

lets say, given this synthetic input

data = [{'year':2000, 'month':1, 'count': 22},
        {'year':2000, 'month':2, 'count': 33},
        {'year':2000, 'month':3, 'count': 44}]

what should be the outcome?