Python dictionary increment

Question

In Python it\'s annoying to have to check whether a key is in the dictionary first before incrementing it:

if key in my_dict:
  my_dict[key] += num
else:
  m         


        

Answer 1

Any one of .get or .setdefault can be used:

.get() give default value passed in the function if there is no valid key

my_dict[key] = my_dict.get(key, 0) + num

.setdefault () create a key with default value passed

my_dict[key] = my_dict.setdefault(key, 0) + num