Solution

Solution

A variable is a storage container in a computer's memory, that allows storage, retrieval and manipulation of data. The value of a variable can change throughout the execution of a program:

age = 71
print("Ahmad lived for", age, "years")
age = 60
print("Iqbal lived for", age, "years")

Variable names in Python must begin with a letter or an underscore. Later characters can be letters, digits, or underscores. Names are case-sensitive, and reserved keywords such as for, while, and if cannot be used as variable names.

Common types include:

• Integer (int): whole numbers, for example age = 17
• Floating-point (float): decimal numbers, for example price = 19.99
• String (str): text, for example name = "Ali"
• Boolean (bool): True or False, for example is_student = True