from collections import defaultdict
data = [(2010, 2), (2009, 4), (1989, 8), (2009, 7)]
d = defaultdict(list)
print (d) # output --> defaultdict(<type 'list'>, {})
for year, month in data:
d[year].append(month)
print (d) # output --> defaultdict(<type 'list'>, {2009: [4, 7], 2010: [2], 1989: [8]})
a["abc"] = [1, 2, "bob"]
keys = ['firstKey', 'secondKey', 'thirdKey']
for key in keys:
myDictionary.get(key)