nested_dicr

nested_dict = {
    'a': {
        'b': {
            'c': 10,
            'd': 20
        },
        'e': 30
    },
    'f': 40
}
keys = ['a', 'b', 'c']

for key in keys:
        # Check if the current key exists in the current dictionary
        if key in nested_dict:
            # Update the current dictionary to the nested dictionary corresponding to the key
            nested_dict = nested_dict[key]
            print(nested_dict)
        else:
            # If the key does not exist, return None
            print(None)