how to find number of unique keys in dictionary python code example

Example 1: find all unique items in dictionary value python

L = [{"V":"S001"}, {"V": "S002"}, {"VI": "S001"}, {"VI": "S005"}, {"VII":"S005"}, {"V":"S009"},{"VIII":"S007"}]
print("Original List: ",L)
u_value = set( val for dic in L for val in dic.values())
print("Unique Values: ",u_value)

Example 2: find number of unique keys in the dictionary

# find number of unique keys in the dictionary
keys_num = len(dictionary.keys())