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Grade 9 Tracing Code (Python) Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Computer Science

Unit 2: Programming FundamentalsControl StructuresCSTA 3A-AP-15

Reading short Python programs with variables, if/else and loops and working out what they print. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Tracing Code (Python)

Grade 9 · Computer Science

Score___ / 12

Name

Class

Date

Learning goal: Control Structures · CSTA 3A-AP-15

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

RememberReading Python

x = 5store 5 in xrange(1, 4)1, 2, 3(stops before 4)// and %7 // 2 = 37 % 2 = 1Indentindented linesbelong to the loop/if
  1. 1

    What does this program print?

    1total = 02for i in range(1, 8):3total = total + i * 14print(total)
  2. 2

    What does this program print?

    1word = "KEYBOARD"2print(word[0] + word[-1])
  3. 3

    What does this program print?

    1word = "PYTHON"2print(word[2] + word[-1])
  4. 4

    What does this program print?

    1word = "NETWORK"2print(word[3] + word[-1])
  5. 5

    What does this program print?

    1x = 302if x > 20:3print("big")4elif x == 20:5print("equal")6else:7print("small")
  6. 6

    What does this program print?

    1word = "ALGORITHM"2print(word[0] + word[-1])
  7. 7

    What does this program print?

    1x = 32if x > 16:3print("big")4elif x == 16:5print("equal")6else:7print("small")
  8. 8

    What does this program print?

    1total = 02for i in range(1, 5):3total = total + i * 14print(total)
  9. 9

    What does this program print?

    1word = "ALGORITHM"2print(word[3] + word[-1])
  10. 10

    What does this program print?

    1total = 02for i in range(1, 6):3total = total + i * 24print(total)
  11. 11

    What does this program print?

    1total = 02for i in range(1, 8):3total = total + i * 34print(total)
  12. 12

    What does this program print?

    1word = "PYTHON"2print(word[1] + word[-1])

★ Challenge corner for fast finishers

In a list of every 3-bit pattern, how many patterns have exactly one 1?

421

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/9/code_tracing

Answer key (click to show)
  1. 1.28
  2. 2.KD
  3. 3.TN
  4. 4.WK
  5. 5.big
  6. 6.AM
  7. 7.small
  8. 8.10
  9. 9.OM
  10. 10.30
  11. 11.84
  12. 12.YN
  13. ★3 (challenge corner)

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