Get key by Python dictionary value

interactive.txt

>>> list_to_dict=[{"a":1},{"b":2}]
>>> for key, value in list_to_dict.items():
...   if value == 1:
...     break
... 
>>> key
'a'

keyof.py

def keyof(dictionary, value):
  """Find key belonging to the provided value.
  
  >>> veggie_to_cost = {'cabbage': 1, 'carrot': 2}
  >>> keyof(veggie_to_cost, 1)
  'cabbage'
  """
  for key, candidate in dictionary.items():
    if value == candidate:
      return key
  raise ValueError(f"Value {value} not found in dictionary")