Creating a Variable0%
Output Variables & Printing Techniques

Creating a Variable

Beginner8 min read•Updated: 2026-09-03
Study Materials

Creating a Variable

Variables in Python are created at the exact moment a value is bound to them with the '=' operator.

Key Concepts & Detailed Explanation

Python uses dynamic typing. A variable can reference an integer at one moment and be rebound to a string later. Every object has a unique integer identity in memory, discoverable with id().

Code Examples & Output

Python
# Dynamic re-binding
data = 100
print("Type:", type(data), "Memory ID:", id(data))
 
data = "MSK Institute"
print("Type:", type(data), "Memory ID:", id(data))

Expected Output:

Output
Type: <class 'int'> Memory ID: ...
Type: <class 'str'> Memory ID: ...

Best Practices & Common Pitfalls

Although Python allows rebinding a variable to a different type, keeping types consistent improves code readability.

Practice Quiz

1. What function reveals the unique memory address of a Python object?

  • A) address()
  • B) id()
  • C) pointer()
  • D) mem()
Answer: B Explanation: id() returns the object's unique memory identity.

2. Do you have to declare variable types in Python before assigning values?

  • A) Yes
  • B) No, Python is dynamically typed
  • C) Only inside classes
  • D) Only in scripts
Answer: B Explanation: Python infers types dynamically upon assignment.

Practice Challenge

Create three variables of different types, print their values, their types using type(), and their memory IDs using id().

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