Embedded Files
Learning Objectives
Learning Objectives
By the end of this lesson, you will be able to:
🎯 Use if, elif, and else statements to control program flow.
🎯 Write nested conditionals.
🎯 Apply Boolean expressions and logical operators.
LESSON OVERVIEW
LESSON OVERVIEW
This lesson is all about making decisions in code. You'll learn to use if, elif, and else statements to create decision structures. You'll also explore nested conditions and logical operations (and, or, not).
📘 Examples
📘 Examples
➊ Using if, elif, and else
➊ Using if, elif, and else
🔹 This structure checks conditions in order. The first true condition runs.
🔹 This structure checks conditions in order. The first true condition runs.
Python Code
x = int(input("Enter a number: "))
if x > 0:
   print("Positive")
elif x == 0:
   print("Zero")
else:
   print("Negative")
✅ Try It:
✅ Try It:
Open Google Colab, create a new notebook, and run the examples above in new code cells.
âž‹ Nested condition
âž‹ Nested condition
🔹 You can place if statements inside other if blocks for more specific decisions.
🔹 You can place if statements inside other if blocks for more specific decisions.
Python Code
x = int(input("Enter a number: "))
if x > 0:
   if x > 10:
       print("Greater than 10")
   else:
       print("Between 1 and 10")
else:
   print("Zero or Negative")
✅ Try It:
✅ Try It:
Run the examples above in new code cells.
➌ Boolean expressions and logical operators
➌ Boolean expressions and logical operators
🔹 Use and, or, and not to combine multiple conditions.
🔹 Use and, or, and not to combine multiple conditions.
Python Code
x = 5
y = 10
if x > 0 and y > 0:
   print("Both are positive")
✅ Try It:
✅ Try It:
Run the examples above in new code cells.
Self-Check Quiz
Self-Check Quiz
🧠Answer these to test your understanding.
What does this code print if x = -3?
if x > 0:
   print("A")
elif x == 0:
   print("B")
else:
   print("C")
HANDS-ON TASK
HANDS-ON TASK
🔧 Instructions:
Write a program that categorizes someone’s age based on their age input:
Child: <12
Teen: 12–17
Adult: 18–64
Senior: 65+
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