python dictinory

What are the keys of {"a":1,"b":2}?

["a","b"]

What are the values of {"a":1,"b":2}?

[1,2]

What will be the output of {"a":1,"b":2}["a"]?

1

What will be the output of {"a":1,"b":2}["c"]?

KeyError

How to safely access a non-existing key with a default?

dict.get("key",default)

What does {"x":10,"y":20}.get("z",0) return?

0

What is the result of len({"a":1,"b":2,"c":3})?

3

What is the output of {"p":[1,2],"q":(3,4)}["p"]?

[1,2]

Which syntax gives keys as a list?

list(dict.keys())

Which syntax gives values as a list?

list(dict.values())

What is the output type of dict.items()?

dict_items

What happens if you assign dict1["z"]=50 when dict1={"x":10}?

Adds new key-value pair

How do you remove a key from a dictionary?

del dict["key"]

What does dict.pop("x") do?

Removes key "x" and returns its value

What does dict.clear() do?

Removes all items from dictionary

What is the result of "a" in {"a":1,"b":2}?

True

What is the result of 1 in {"a":1,"b":2}?

False (checks keys, not values)

Can dictionary keys be duplicated?

No, later assignment overwrites earlier

Can dictionary values be duplicated?

Yes

Can a list be a dictionary key?

No, lists are unhashable

Can a tuple be a dictionary key?

Yes, if immutable