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Chapter 032 / 132 · Level 2 · Core Python

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Chapter 32 of 132 · Level 2 · Core Python · Python demonstrations with recorded outputs. Learn through reading, predicting and testing real Python code.

Code + real outputPractice + explanationsOffline Python exercises
Course disclaimer · independent educational content
EasyTutorGuide creates independent educational tutorials. Python and other product names remain the property of their owners; this course is not endorsed by the Python Software Foundation or third-party providers. Examples are for learning and should be reviewed and tested before production use. Do not expose real API keys or private data. Translation is automated and may introduce errors; code examples remain untranslated. Terms · Privacy · Legal.
01 · Why this concept matters

if/elif/else makes exactly one branch of this decision chain execute. Order matters: the first true condition wins.

Learning goal: Conditional branches. Start by reading what the program does, then inspect its exact output. Where an example illustrates only a prerequisite, study the named advanced feature separately before using it in production.

02 · The important subtopics

Study these connected ideas as you work through the demonstration:

  • if elif else
  • Nested and combined decisions
  • Guard clauses and early exits
  • match/case basics and appropriate uses
03 · Pinpoint: read the code line by line
  1. Line 1temperature = 17Create, update, or use a value. Notice what values enter this statement and which names it affects.
  2. Line 2if temperature < 10:Control the next step. Notice what values enter this statement and which names it affects.
  3. Line 3print('Coat')Display a result. Notice what values enter this statement and which names it affects.
  4. Line 4elif temperature < 20:Control the next step. Notice what values enter this statement and which names it affects.
  5. Line 5print('Sweater')Display a result. Notice what values enter this statement and which names it affects.
  6. Line 6else:Control the next step. Notice what values enter this statement and which names it affects.
  7. Line 7print('Light clothes')Display a result. Notice what values enter this statement and which names it affects.
Input → operation → output

Find the literal input values and arguments, follow each operation in execution order, and verify the result below. This habit turns a code listing into a testable explanation.

04 · Runnable Python example and verified output

Conditional branches: working demonstration

Python · runnable
PYTHON CODE
temperature = 17
if temperature < 10:
    print('Coat')
elif temperature < 20:
    print('Sweater')
else:
    print('Light clothes')
Verified execution ▼
Sweater

Why it works: if/elif/else makes exactly one branch of this decision chain execute. Order matters: the first true condition wins.

Worked example 2 · Conditional Branches in practice

Python · executed and checked
PYTHON CODE
score = 86
if score >= 90: grade = 'A'
elif score >= 80: grade = 'B'
else: grade = 'Keep practicing'
print(grade)
Verified execution output
B

Pinpoint learning: This practical conditional branches demonstration uses a small input you can inspect. Run it exactly as shown, compare the displayed result, then change one value and predict how the result will change.

Understand the code line by line
  1. 1: score = 86 — Store or update the value on the left using the expression on the right.
  2. 2: if score >= 90: grade = 'A' — Choose which indented branch executes based on a condition.
  3. 3: elif score >= 80: grade = 'B' — Choose which indented branch executes based on a condition.
  4. 4: else: grade = 'Keep practicing' — Choose which indented branch executes based on a condition.
  5. 5: print(grade) — Display the value so you can compare it with the verified output.
05 · Independent practice and answer guidance

Exercise A · Adapt the code

Make a three-way delivery-fee rule based on order total.

Exercise B · Predict

Before pressing Run, predict the first displayed line. Next, change one literal value and record the new observed output. Explain the difference in one clear sentence.

Exercise C · Debug

Make a temporary invalid change, read the exception or failed assertion if one occurs, restore the working code, and explain the repair.

Worked explanation for the original example

if/elif/else makes exactly one branch of this decision chain execute. Order matters: the first true condition wins.

Sweater
06 · Build, verify and advance

Real-world task: Develop a command-based menu for a small shop.

Mastery checklist

Run the original code; explain the important lines; change one input and verify the new outcome; use a test or recorded result to justify your conclusion.