CSTA.3A-AP-14 / AP.CS.A.1✓ Iowa Department of Education AlignedAcademic Year 2026–27
Python Programming, Variables & Control Flow
Write clean, idiomatic Python code utilizing variables, lists, if-elif-else statements, and while/for loops.
Why It Matters:Powers modern artificial intelligence, cloud web applications, and automated scientific pipelines.
Curated Video Instruction
● Verified Active EmbedSTEP-BY-STEP PROOF
Worked Example
Write a Python function to compute the average temperature from a sensor readings list:
1
Define function and handle empty edge case
def compute_avg(readings): if not readings: return 0.0
Prevents division by zero.
2
Calculate sum and length
total = sum(readings); count = len(readings)
Utilize built-in Python aggregators.
3
Return floating point average
return total / count
Dividing yields the arithmetic mean.
✓Verification Check
Verify test case [20.0, 30.0, 40.0]: sum=90, count=3, avg=30.0.
90.0 / 3 = 30.0
•
30.0 = 30.0
⚠️ Common Pitfalls & Misconceptions
Off-by-one error in list indexing
✗ Accessing the last element of a list of length 5 using my_list[5]✓ Python lists are zero-indexed, so valid indices for length 5 are 0 through 4 (or my_list[-1])
Zero-indexing means the final element is at index len(list) - 1.
INTERACTIVE DRILLS
Guided Practice
Practice Question1 of 1
Step-by-step Feedback
Which Python keyword is used to define a reusable block of code (function)?
MASTERY BENCHMARK
Official Assessment Quiz
Formal Assessment
Python Programming, Variables & Control Flow
Passing Criteria:70% or higher
Question 1 of 1
What data type is the result of 10 / 2 in Python 3?
Education to Career Navigation
Where This Lesson Leads
Software Engineers, Data Scientists, and Machine Learning Engineers use Python every day.