Problem 1: Creating and Accessing Dictionaries
Create a dictionary named `student_grades` with the following key-value pairs:
- `Alice`: 88
- `Bob`: 72
- `Charlie`: 90
- `Diana`: 85
Access the grade for `Bob` from the dictionary and print it out.
Problem 2: Updating Dictionary Content
Given the dictionary `product_prices`, update the price of `milk` to 1.25 and add a new item `bread` with the price 1.85.
`product_prices` = {'eggs': 2.00, 'milk': 1.10, 'cheese': 3.50}
Print the updated dictionary.
Problem 3: Dictionary Keys and Values
Create a dictionary `inventory` with at least three items (keys) and their quantities (values). Then, retrieve and print a list of items (keys) and a separate list of
quantities (values).
Problem 4: Set Creation and Adding Elements
Create a set named `unique_numbers` and add the numbers 3, 5, 7, and 5 to it. Print the resulting set.
