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hsleonis/inverse_dict.md

Created May 25, 2020 22:41
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Inverts a dictionary with non-unique hashable values.
Raw
inverse_dict.md 
def inverse_dict(obj):
  inv_obj = {}
  for key, value in obj.items():
    inv_obj.setdefault(value, list()).append(key)
  return inv_obj
ages = {
  "Car": 5,
  "Bat": 5,
  "Ball": 8,
}
inverse_dict(ages) # { 5: ["Car", "Bat"], 8: ["Ball"] }
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