Initializing a dictionary in python with a key value and no corresponding values
Use the fromkeys function to initialize a dictionary with any default value. In your case, you will initialize with None since you don't have a default value in mind.
empty_dict = dict.fromkeys(['apple','ball'])this will initialize empty_dict as:
empty_dict = {'apple': None, 'ball': None}As an alternative, if you wanted to initialize the dictionary with some default value other than None, you can do:
default_value = 'xyz'nonempty_dict = dict.fromkeys(['apple','ball'],default_value)
you could use a defaultdict. It will let you set dictionary values without worrying if the key already exists. If you access a key that has not been initialized yet it will return a value you specify (in the below example it will return None)
from collections import defaultdictyour_dict = defaultdict(lambda : None)