defult dict py

from collections import defaultdict 
  
# Defining a dict containing lists 
d = defaultdict(list) 
  
for i in range(5): 
    d[i].append(i) 
      
print("Dictionary with values as list:") 
print(d) 

#Output:
#Dictionary with values as list:
#defaultdict(<class 'list'>, {0: [0], 1: [1], 2: [2], 3: [3], 4: [4]})