Dict methods

Learn get, keys, values, items methods.

Dict methods

Common dict methods are keys(), values(), items():

person = {"name": "Alex", "age": 28}
print(list(person.keys()))    # ['name', 'age']
print(list(person.values()))  # ['Alex', 28]
print(list(person.items()))   # [('name', 'Alex'), ('age', 28)]

These methods are handy for looping over a dict. With items() you get the key and value together.

get, pop, update

Other common dict methods are get(key, default), pop(key), update(other):

person = {"name": "Alex"}
print(person.get("age", 0))    # 0
person.pop("name")             # returns "Alex", removes it
person.update({"age": 28})      # adds a new key

get returns a default instead of KeyError. pop removes a key and returns its value. update merges another dict.

Exercise Print dict keys and values

Assign the dict {"name": "Ayse", "age": 28} to person. Assign list(person.keys()) to keys and list(person.values()) to values. Then print print(keys, values).

Show example solution

person = {"name": "Ayse", "age": 28}
keys = list(person.keys())
values = list(person.values())
print(keys, values)

Test yourself

Match the methods

keys()

Keys
values()

Values
items()

Pairs
get()

Safe access

Complete the get call

person = {"name": "Alex"}
age = person.____("age", 0)

Show answer

person = {"name": "Alex"}
age = person.get("age", 0)

What does person.get("age", 0) return (person = {"name": "Alex"})?
- Raises KeyError
- 0
- None
- 28
Show answer

0 — 'age' is missing, so the default 0 is returned.

Next lesson: Dict comprehension

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