What is it

Different ways of applying a function to dictionary iteratively.

Dictionary Comprehension

def f(x):
  return x + 1

if __name__ == '__main__':
  d = {'A': 0, 'B': 1, 'C': 2}
  dict = {k: f(v) for k, v in d.items()}

  print(dict)
  # {'A': 1, 'B': 2, 'C': 3}

For-Loop

def f(x):
  return x + 1
 
if __name__ == '__main__':
  d = {'A': 0, 'B': 1, 'C': 2}

  for k, v in d.items():
    d[k] = f(v)

  print(d)
  # {'A': 1, 'B': 2, 'C': 3}

Lambda (map)

def f(x):
  return x + 1
 
if __name__ == '__main__':
  d = {'A': 0, 'B': 1, 'C': 2}

  dict = dict(map(lambda x: (x[0], f(x[1])), d.items()))

  print(dict) # {'A': 1, 'B': 2, 'C': 3}