Conditionals Cheatsheet

Complete Python Conditionals cheatsheet with clear examples for quick revision

Conditionals are used to make decisions in a program based on True / False conditions. Python uses several forms of conditionals:

1

if Statement

Used to execute code only when a condition is True. Note : Condition must evaluate to True or False. Indentation is mandatory in Python.

if_statement.py

# if Statement Example
age = 18
if age >= 18:  # condition is True
    print("You are eligible to vote")
# NOTE -> if condition is False, there will be no output

Indentation is required to define the block that runs when the condition is True.

2

if-else Statement

Used when you want two possible outcomes.

if_else_example.py

# if-else Example
num = int(input("Enter a number: "))
if num % 2 == 0:
    print("Even number")
else:
    print("Odd number")

# Examples:
# num = 4 -> Output: Even number
# num = 9 -> Output: Odd number
# Note: else runs only when if condition is False

3

Short-hand (Ternary) if

Used for single-line conditions.

ternary_example.py

a = 5
b = 10
max_value = a if a > b else b
print(max_value)

Best for single condition + single action. Becomes confusing for complex logic.

4

if-elif-else Statement

Used to check multiple conditions.

if_elif_else.py

marks = 72
if marks >= 90:
    print("Grade A")
elif marks >= 75:
    print("Grade B")
elif marks >= 50:
    print("Grade C")
else:
    print("Fail")

# Note:
# 1. Python checks conditions top to bottom
# 2. Only one block runs

5

Nested Conditions

A condition inside another condition.

Example 1

nested_example1.py

num = 10
if num > 0:
    if num % 2 == 0:
        print("Even Number")
    else:
        print("Odd Number")
else:
    print("Negative Number")

Example 2

Marks	Attendance	Result	Grade	Scholarship
< 40	Any	Fail	F	No
40 – 59	Any	Pass	C	No
60 – 84	Any	Pass	B	No
≥ 85	< 75	Pass	A	No
≥ 85	≥ 75	Pass	A	Yes

nested_example2.py

marks = int(input("Enter marks: "))
attendance = int(input("Enter attendance percentage: "))

if marks >= 40:  # First condition (pass/fail)
    print("Result: Pass")
    if marks >= 85:  # Nested if-elif-else
        if attendance >= 75:
            print("Grade: A")
            print("Scholarship: Eligible")
        else:
            print("Grade: A")
            print("Scholarship: Not eligible (low attendance)")
    elif marks >= 60:
        print("Grade: B")
        print("Scholarship: Not eligible")
    else:
        print("Grade: C")
        print("Scholarship: Not eligible")
else:
    print("Result: Fail")
    print("Grade: F")

6

pass Statement

Used when a condition is required syntactically but no action is needed.

pass_example.py

if age > 18:
    pass