Python: 'Dictionary Comprehensions'

Snipplr-34616.py

emails = {'Dick': 'bob@example.com', 'Jane': 'jane@example.com', 'Stou': 'stou@example.net'}

email_at_dotcom = dict( [name, '.com' in email] for name, email in emails.iteritems() )

# email_at_dotcom now is {'Dick': True, 'Jane': True, 'Stou': False}




# ANOTHER OPTION TO CREATE DICTS ON THE FLY:

d = dict([("n= %s" % x, x) for x in range(10)])

# {'n= 9': 9, 'n= 8': 8, 'n= 3': 3, 'n= 2': 2, 'n= 1': 1, 'n= 0': 0, 'n= 7': 7, 'n= 6': 6, 'n= 5': 5, 'n= 4': 4}