Python: transform list of tuples in dictionary

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Wondering if there is a more idiomatic (pythonic) way of doing this. I have a list of tuples returned by a cursor object, and I'm trying to regroup the data in a dictionary. The data I get is formatted as such:

[("Département d'informatique", 119, 74, 193),
 ("Département d'informatique", 193, 67, 260), 
 ("Département de chimie", 355, 44, 399) ... ]

Notice that departments repeat. Each line with the same department represents a different kind of data. I need to regroup that data in a dictionary that contains a key (department name) and the value would be a list of all the tuples that have that department as its first member. So something like this:

{ "Département d'informatique": [(119, 74, 193), (193,67,260) ...] }

Here is my code. It's working at the moment but I'm not sure if it's the most efficient/pythonic way of doing things.

def preparer_donnees(data):
    ret = { ligne[0] : [] for ligne in data }

    for ligne in data:
        for entree in ligne[1:]:
            ret[ligne[0]].append(entree)

    return ret

Thanks!

asked 31 secs ago

insurgenesis

7