Python if Statement

Introduction

The if statement is one of the most important decision-making statements in Python. It allows a program to execute specific code only when a particular condition is true.

In real-world applications, decisions are made constantly. For example:

Checking whether a user is eligible to vote
Validating login credentials
Determining whether a test case passed or failed
Checking account balances before transactions
Validating API responses

The Python if statement makes these decisions possible by evaluating conditions and executing code accordingly.

In this tutorial, you will learn about the Python if statement, its syntax, examples, real-world applications, common mistakes, and best practices.

What is an if Statement?

An if statement is used to execute a block of code only when a specified condition evaluates to True.

If the condition evaluates to False, the code block is skipped.

Syntax of if Statement

if condition:
    statement

Flow

Python evaluates the condition.
If the condition is True, the code inside the if block executes.
If the condition is False, the block is skipped.

Simple if Statement Example

age = 20

if age >= 18:
    print("Eligible to Vote")

Output

Eligible to Vote

Since the condition age >= 18 is True, Python executes the print statement.

Example with False Condition

age = 15

if age >= 18:
    print("Eligible to Vote")

Output

No Output

The condition is False, so the code block is skipped.

Understanding Indentation

Python uses indentation to define blocks of code.

Correct Example

age = 20

if age >= 18:
    print("Eligible to Vote")

Incorrect Example

age = 20

if age >= 18:
print("Eligible to Vote")

Error

IndentationError

The code inside the if block must be indented.

Using Comparison Operators in if Statements

Comparison operators are commonly used with if.

Operator	Meaning
==	Equal to
!=	Not equal to
>	Greater than
<	Less than
>=	Greater than or equal to
<=	Less than or equal to

Example: Equal To

marks = 50

if marks == 50:
    print("Marks are 50")

Output

Marks are 50

Example: Not Equal To

marks = 75

if marks != 50:
    print("Marks are not 50")

Output

Marks are not 50

Example: Greater Than

salary = 60000

if salary > 50000:
    print("High Salary")

Output

High Salary

Using Logical Operators in if Statements

Logical operators combine multiple conditions.

Operator	Meaning
and	Both conditions must be True
or	At least one condition must be True
not	Reverses the result

Example: and Operator

age = 25
citizen = True

if age >= 18 and citizen:
    print("Eligible to Vote")

Output

Eligible to Vote

Example: or Operator

role = "admin"

if role == "admin" or role == "manager":
    print("Access Granted")

Output

Access Granted

Example: not Operator

is_blocked = False

if not is_blocked:
    print("Access Allowed")

Output

Access Allowed

Using if with Strings

name = "Python"

if name == "Python":
    print("Programming Language Found")

Output

Programming Language Found

Using if with Numbers

number = 100

if number > 50:
    print("Number is Greater Than 50")

Output

Number is Greater Than 50

Using if with Boolean Values

is_logged_in = True

if is_logged_in:
    print("Welcome User")

Output

Welcome User

Using User Input with if Statement

age = int(input("Enter your age: "))

if age >= 18:
    print("Eligible to Vote")

Sample Input

Output

Eligible to Vote

Multiple Statements Inside if Block

salary = 50000

if salary >= 50000:
    print("Employee Eligible")
    print("Bonus Approved")
    print("Notification Sent")

Output

Employee Eligible
Bonus Approved
Notification Sent

All indented statements execute when the condition is True.

Nested if Statement

An if statement can contain another if statement.

age = 25

if age >= 18:
    if age >= 21:
        print("Eligible for Adult Membership")

Output

Eligible for Adult Membership

Real-World Example: ATM Withdrawal

balance = 10000
withdraw_amount = 5000

if withdraw_amount <= balance:
    print("Withdrawal Successful")

Output

Withdrawal Successful

Real-World Example: Login Validation

username = "admin"

if username == "admin":
    print("Login Successful")

Output

Login Successful

Real-World Example: Exam Result

marks = 75

if marks >= 35:
    print("Pass")

Output

Pass

if Statement in Automation Testing

The if statement is extensively used in Selenium, API Testing, and Automation Frameworks.

Example: Status Code Validation

status_code = 200

if status_code == 200:
    print("API Test Passed")

Output

API Test Passed

Example: Element Validation

element_found = True

if element_found:
    print("Element Present")

Output

Element Present

Example: Test Result Validation

actual_title = "Dashboard"
expected_title = "Dashboard"

if actual_title == expected_title:
    print("Test Passed")

Output

Test Passed

Truthy and Falsy Values

Python treats certain values as True or False automatically.

Truthy Values

True
1
"Python"
[1, 2]

Falsy Values

False
0
""
[]
None

Example

name = "John"

if name:
    print("Name Available")

Output

Name Available

Example

name = ""

if name:
    print("Name Available")

Output

No Output

Empty strings evaluate to False.

Common Mistakes Beginners Make

Using = Instead of ==

Incorrect

age = 18

if age = 18:
    print("Eligible")

Error

SyntaxError

Correct

if age == 18:
    print("Eligible")

Forgetting Colon (:)

Incorrect

if age >= 18
    print("Eligible")

Error

SyntaxError

Correct

if age >= 18:
    print("Eligible")

Incorrect Indentation

Incorrect

if age >= 18:
print("Eligible")

Error

IndentationError

Correct

if age >= 18:
    print("Eligible")

Best Practices

Use Meaningful Conditions

if user_age >= 18:

Instead of:

if x >= 18:

Keep Conditions Simple

Avoid overly complex conditions whenever possible.

Use Boolean Variables

if is_logged_in:

Instead of:

if is_logged_in == True:

Properly Indent Code Blocks

Consistent indentation improves readability.

Advantages of if Statement

Enables decision-making in programs
Controls program flow
Makes applications dynamic
Supports real-world business logic
Essential for automation testing and software development

Conclusion

The Python if statement is a fundamental control structure that allows programs to make decisions based on conditions. It evaluates a condition and executes code only when that condition is True.

Whether you are building web applications, automation frameworks, APIs, desktop applications, or simple scripts, the if statement is one of the most frequently used programming constructs.

Understanding and mastering the if statement is essential for writing intelligent and dynamic Python programs.

Frequently Asked Questions (FAQs)

What is an if statement in Python?

An if statement executes a block of code when a specified condition is True.

Example:

age = 20

if age >= 18:
    print("Eligible")

What happens when the condition is False?

Python skips the if block and continues with the rest of the program.

Why is indentation important in an if statement?

Indentation tells Python which statements belong to the if block.

Can an if statement contain multiple statements?

Yes.

Example:

if True:
    print("Line 1")
    print("Line 2")

Can I use logical operators inside an if statement?

Yes.

Example:

age = 20
citizen = True

if age >= 18 and citizen:
    print("Eligible")

Key Takeaways

The if statement is used for decision-making.
Code executes only when the condition evaluates to True.
Python uses indentation to define if blocks.
Comparison operators are commonly used with if.
Logical operators can combine multiple conditions.
if statements work with numbers, strings, Booleans, and user input.
They are widely used in automation testing, validation, authentication, and business logic.
Mastering if statements is essential for Python programming.