Dictionary comprehensions in Python

dictionary_comprehensions.py

# python 2.7 and later now allows list comprehensions against dictionaries too!
foo = {"alice": "camper", "joe": "medic", "paul": "sniper"}

# Now, you can do dictionary comprehensions like this (2.7):
bar = {first: last for first,last in foo.items() if last not in ["camper", "sniper"]}

# or, you can do it the old way:
baz = dict([(first, last) for first,last in foo.items() if last.lower() not in ["camper", "sniper"]])

# In each case, the result is:
print {'joe': 'medic'}