Change dictionary keys in a list

gistfile1.py

# Original list of dicts
old = [{
    'product_name': 'A Name',
    'product_id': '666'
}]

# New keys
mapping = {
    'product_name': 'name',
    'product_id': 'id'
}

new = [dict((mapping[k], v) for k,v in o.iteritems()) for o in old]

'''
Now it looks like
[{
    'name': 'A Name',
    'id': '666'
}]
'''