Dictionary comprehension

dict_comprehension.py

# remove keys
a = dict(a=5, b=6, c=7, d=8)
remove = set(["c", "d"])
a = { k: v for k,v in a.items() if k not in remove }
# a = { "a": 5, "b": 6 }

# keep keys
a = dict(a=5, b=6, c=7, d=8)
keep = remove
a = { k: v for k,v in a.items() if k in keep }
# a = { "c": 7, "d": 8 }

# add to all values
a = dict(a=5, b=6, c=7, d=8)
a = { k: v+1 for k,v in a.items() }
# a = { "a": 6, "b": 7, "c": 8, "d": 9 }