Nested if statements mean an if statement inside another if statement. Here is the basic syntax:
Syntax
Nested if syntax
if condition1:
# Executes when condition1 is true
if condition2:
# Executes when condition1 and condition2 are true
Explanation : If condition1 is True, Python checks condition2. If both condition1 and condition2 are True, Python executes the nested code block. If condition1 is False, Python skips the nested if statement.
Basic example
Python nested if basic example
x = 10
y = 5
if x == 10:
if y == 5:
print("x is 10 and y is 5")
Output
x is 10 and y is 5
Explanation : In this example, Python first checks if x is 10. If x is 10, Python checks if y is 5. If both conditions are True, Python prints “x is 10 and y is 5”.
Nested if statements can also include elif and else statements:
Nested if example with elif in python
x = 10
y = 5
if x == 10:
if y == 5:
print("x is 10 and y is 5")
elif y == 6:
print("x is 10 and y is 6")
else:
print("x is 10 and y is not 5 or 6")
else:
print("x is not 10")
Output
x is 10 and y is 5
Explanation : In this example, Python first checks if x is 10. If x is 10, Python checks the nested if statement. If y is 5, Python prints “x is 10 and y is 5”. If y is 6, Python prints “x is 10 and y is 6”. If y is neither 5 nor 6, Python prints “x is 10 and y is not 5 or 6”. If x is not 10, Python skips the nested if statement and prints “x is not 10”.
Note : Remember, Python executes only the first True condition in an if-elif-else chain. If an if or elif condition is True, Python skips the rest of the chain. The else clause is a catch-all for any condition not caught by the preceding conditions.
here are some examples to understand nested if statements in Python:
Checking if a number is positive and even:
Checking if a number is positive and even using if else in python
num = 10
if num > 0:
if num % 2 == 0:
print("Number is positive and even")
else:
print("Number is positive but not even")
else:
print("Number is not positive")
Output
Number is positive and even
Checking if a person is eligible to vote and to drive:
Checking person is eligible to vote and drive or not in python
age = 20
if age >= 18:
print("Person is eligible to vote")
if age >= 16:
print("Person is also eligible to drive")
else:
print("Person is not eligible to vote or drive")
Output
Person is eligible to vote
Person is also eligible to drive
Checking grades:
Finding grade of a student by marks using if else in python
grade = 85
if grade >= 60:
if grade >= 70:
if grade >= 80:
if grade >= 90:
print("A")
else:
print("B")
else:
print("C")
else:
print("D")
else:
print("F")
Output
B
Checking if a number is divisible by 2 and 3:
Checking if a number is divisible by 2 and 3 or not
num = 6
if num % 2 == 0:
if num % 3 == 0:
print("Number is divisible by 2 and 3")
else:
print("Number is divisible by 2 but not by 3")
else:
print("Number is not divisible by 2")
Output
Number is divisible by 2 and 3
Checking if a point is within a rectangle:
Checking if a point is within a rectangle in python
x, y = 5, 5 # Point coordinates
if 0 <= x <= 10: # Check if x is within the rectangle
if 0 <= y <= 10: # Check if y is within the rectangle
print("Point is within the rectangle")
else:
print("Point is outside the rectangle")
else:
print("Point is outside the rectangle")
Output
Point is within the rectangle
Lets see about match case as next topic.
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