Syntax: Dict Get and In Keyword

Python provides methods to efficiently search for keys in a dictionary and retrieve the corresponding values.

Retriving a Dictionary Value by its Key

The get method retrieves the value for a given key if it exists in the dictionary, and returns None otherwise.

user = {
  "name": "Bob",
  "email": "[email protected]",
  "age": 35
}
print(user.get("name"))
print(user.get("address"))

> Bob

> None

Checking if a Dictionary Contains a Key

The in keyword checks if a key exists in the dictionary and returns a boolean value.

user = {
  "name": "Bob",
  "email": "[email protected]",
  "age": 35
}
print("name" in user)
print("address" in user)

> True

> False

Practice: Reading Dictionaries using Keys

1. Create a dictionary student with keys "name", "id", and "course" and assign appropriate values to each key.

2. Print the value for the key "id" using the get method.

3. Check if the key "age" exists in the dictionary using the in keyword and print the result.

> 123

> False

student = {
  "name": "Alice",
  "id": 123,
  "course": "Data Science"
}
print(student.get("id"))
print("age" in student)

Well done! Understanding how to use get and in with dictionaries is essential for efficiently retrieving data from dictionaries.