python append value to dictionary list

1# Creating an empty dictionary 
2myDict = {} 
3  
4# Adding list as value 
5myDict["key1"] = [1, 2] 
6  
7# creating a list 
8lst = ['Geeks', 'For', 'Geeks'] 
9  
10# Adding this list as sublist in myDict 
11myDict["key1"].append(lst) 
12
13# Print Dictionary
14print(myDict)

1import collections
2
3a_dict = collections.defaultdict(list) # a dictionary key --> list (of any stuff)
4a_dict["a"].append("hello")
5
6print(a_dict)
7>>> defaultdict(<class 'list'>, {'a': ['hello']})
8
9a_dict["a"].append("kite")
10
11print(a_dict)
12>>> defaultdict(<class 'list'>, {'a': ['hello', 'kite']})

1d = {1:2}
2d.update({2: 4})
3print(d) # {1: 2, 2: 4}