Python If Else Statements Conditional Statements (original) (raw)

Last Updated : 08 Mar, 2025

In Python, If-Else isa fundamental conditional statement used for decision-making in programming. If…Else statement allows to execution of specific blocks of code depending on the condition is True or False.

if Statement

**if statement is the most simple decision-making statement. If the condition evaluates to True, the block of code inside the if statement is executed.

if---------statement

If Statement

**Example of If Statement:

Python `

i = 10

Checking if i is greater than 15

if (i > 15): print("10 is less than 15")

print("I am Not in if")

if….else Statement

**if…else statement is a control statement that helps in decision-making based on specific conditions. When the if condition is False. If the condition in the if statement is not true, the else block will be executed.

if---------else---------statement

If….else Statement

Let’s look at some examples of if-else statements.

Simple if-else

Python `

i = 20

Checking if i is greater than 0

if (i > 0): print("i is positive") else: print("i is 0 or Negative")

If Else in One-line

If we need to execute a single statement inside the **if or else block then one-line shorthand can be used.

Python `

a = -2

Ternary conditional to check if number is positive or negative

res = "Positive" if a >= 0 else "Negative" print(res)

Logical Operators with If..Else

We can combine multiple conditions using logical operators such as **and, **or, and **not.

Python `

age = 25 exp = 10

Using '>' operator & 'and' with if-else

if age > 23 and exp > 8: print("Eligible.") else: print("Not eligible.")

Nested If Else Statement

**Nested if…else statement occurs when if…else structure is placed inside another **if or **else block. Nested If..else allows the execution of specific code blocks based on a series of conditional checks.

Nested-statement

Nested if Statement

**Example of Nested If Else Statement:

Python `

i = 10 if (i == 10):

#  First if statement
if (i < 15):
    print("i is smaller than 15")
    
# Nested - if statement
# Will only be executed if statement above
# it is true
if (i < 12):
    print("i is smaller than 12 too")
else:
    print("i is greater than 15")

else: print("i is not equal to 10")

if…elif…else Statement

if-elif-else statement in Python is used for multi-way decision-making. This allows us to check multiple conditions sequentially and execute a specific block of code when a condition is True. If none of the conditions are true, the **else block is executed.

**Example:

Python `

i = 25

Checking if i is equal to 10

if (i == 10): print("i is 10")

Checking if i is equal to 15

elif (i == 15): print("i is 15")

Checking if i is equal to 20

elif (i == 20): print("i is 20")

If none of the above conditions are true

else: print("i is not present")

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