TOPIC 03 OF 18

Decisions with Conditions Python lessons

if, elif, else, truth values, validation, and choosing between outcomes.

10 exercises8+ conceptsBeginner → interview context

WHAT YOU WILL LEARN

Core concepts

Classify even or oddClassify a number's signFind the larger of two valuesFind the largest of three valuesDetect a leap yearConvert a score to a gradeSet an age-based ticket priceValidate and classify a triangle

REUSABLE THINKING

Problem-solving patterns

if · modulo
comparison · elif
comparison · branches
max · list
boolean logic · calendar

LESSON OUTCOME

What this topic builds

Learn the idea once, trace it through two verified cases, then explain why your approach works.

ORDERED LESSONS

All 10 lessons in this topic

Work from top to bottom to build each concept gradually.

#011
Classify even or odd
Classify a locker number into the even or odd row.
StarterPremium
#012
Classify a number's sign
Classify a positive daily profit value.
StarterPremium
#013
Find the larger of two values
Choose the larger of two supplier bids for a comparison report.
BeginnerPremium
#014
Find the largest of three values
Find the highest score among three finalists.
BeginnerPremium
#015
Detect a leap year
Determine whether a scheduling year includes February 29.
BeginnerPremium
#016
Convert a score to a grade
Convert a valid assessment score to its letter grade.
BeginnerPremium
#017
Set an age-based ticket price
Quote the museum price for a school-age visitor.
IntermediatePremium
#018
Validate and classify a triangle
Classify a triangular frame with three equal sides.
IntermediatePremium
#019
Check a basic password policy
Validate a signup password that mixes letters and digits.
IntermediatePremium
#020
Calculate a shipping fee
Determine shipping for a guest whose order reaches the free-shipping threshold.
AdvancedPremium