This Nested Dictionaries lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
A dict value can be another dict. Read the inner value with a second pair of brackets.
get on the outer dict does not search inside. Check each level, or use a default before you index further.
Example 1: Start here
If batch might be missing, read it with get and test the result before the second lookup.
learner = {"name": "Meera", "batch": {"topic": "Python", "room": 3}} # a dictionary; each key has one value
print(learner["batch"]["room"])
Example 2: A dict inside a dict
Read the outer key first, then the inner key.
batch = {"trainer": {"name": "Meera", "city": "Chennai"}} # a dictionary; each key has one value
print(batch["trainer"]["city"])
Example 3: A list inside a dict
The list still uses a numeric index after you open the dictionary.
batch = {"skills": ["Python", "SQL"]} # a dictionary; each key has one value
print(batch["skills"][0])
Example 4: Change a nested value
You can assign through both levels.
batch = {"trainer": {"name": "Meera"}} # a dictionary; each key has one value
batch["trainer"]["name"] = "Arun" # change this one field
print(batch)
If batch might be missing, read it with get and test the result before the second lookup.
