multi line list python

#This
mydict = {
    "key1": 1,
    "key2": 2,
    "key3": 3,
}

Here is what the above code is Doing:
1. We create a dictionary with three key-value pairs.
2. We print out the value of key2.
3. We add a new key-value pair to the dictionary.
4. We print out the dictionary to see the results.