List comprehension to extract a list of tuples from dictionary

Question

I'd like to use list comprehension on the following list;

movie_dicts = [{'title':'A Boy and His Dog', 'year':1975, 'rating':6.6},
           {'title':'Ran', 'year':1985, 'rating': 8.3},
           {'title':'True Grit', 'year':2010, 'rating':8.0},
           {'title':'Scanners', 'year':1981, 'rating': 6.7}]

using my knowledge of list comprehension and dictionaries, I know that

movie_titles = [x['title'] for x in movie_dicts]
print movie_titles

will print a list with movie titles.

In order to extracts a list of (title, year) tuples I've tried -

movie_tuples = [x for ('title','year') in movie_dicts]
print movie_tuples

and I receive the error SyntaxError: can't assign to literal

I'm unsure on how to fetch the two (specific) key/value pairs using list comprehension (doing so would generate a tuple automatically?)

Answer 1

movie_dicts = [
    {'title':'A Boy and His Dog', 'year':1975, 'rating':6.6},
    {'title':'Ran', 'year':1985, 'rating': 8.3},
    {'title':'True Grit', 'year':2010, 'rating':8.0},
    {'title':'Scanners', 'year':1981, 'rating': 6.7}
]

title_year = [(i['title'],i['year']) for i in movie_dicts]

gives

[('A Boy and His Dog', 1975),
 ('Ran', 1985),
 ('True Grit', 2010),
 ('Scanners', 1981)]

OR

import operator
fields = operator.itemgetter('title','year')
title_year = [fields(i) for i in movie_dicts]

which gives exactly the same result.

Answer 2

This version has a minimum of repeating yourself:

>>> fields = "title year".split()
>>> movie_tuples = [tuple(map(d.get,fields)) for d in movie_dicts]