Iterating over key and value of defaultdict dictionaries

If you want to iterate over individual item on an individual collection:

from collections import defaultdict

for k, values in d.items():
    for value in values:
       print(f'{k} - {value}')

if you are using Python 3.6

from collections import defaultdict

for k, v in d.items():
    print(f'{k} - {v}')

you need to iterate over dict.iteritems():

for k,v in d.iteritems():               # will become d.items() in py3k
  print "%s - %s" % (str(k), str(v))

Update: in py3 V3.6+

for k,v in d.items():
  print (f"{k} - {v}")

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