Control Flow in Python: How to Use If, Elif, and Else
How do applications make decisions? In this video, we dissect If-Statements in Python, the fundamental building blocks of decision-making logic in software engineering.
You'll learn how Python uses indentation to group code, how to build fallback paths using "else" statements, and how to chain multiple conditions together using "elif" (else-if) blocks.
📝 CODE WRITTEN IN THIS VIDEO:
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Simple If-Statement (using variables)
age = 20
if age == 20:
print("You can enter!")
Conditional Decision Chain
(Checking age logic without using angled symbols)
if age == 18:
print("Ticket price: $10")
elif age == 15:
print("Ticket price: $7")
else:
print("Ticket price: $5")
🧠 BONUS CHALLENGES:
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Test your conditional logic! Comment your solutions below.
Challenge 1:
What is the output of this code?
score = 80
if score == 90:
print("A")
elif score == 80:
print("B")
else:
print("C")
Options:
A) A
B) B
C) C
Challenge 2:
What happens if you run the following code?
x = 5
if x == 5:
print("Match!")
Options:
A) It prints "Match!"
B) It prints nothing
C) It throws an IndentationError
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