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Grade 12 Tracing Code (Python) Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Computer Science

Unit 2: ProgrammingTracing Programs

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 12 · Computer Science

Score___ / 12

Name

Class

Date

Learning goal: Tracing Programs

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?

    1x = 202if x > 10:3print("big")4elif x == 10:5print("equal")6else:7print("small")
  2. 2

    What does this program print?

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

    What does this program print?

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

    What does this program print?

    1x = 102if x > 14:3print("big")4elif x == 14:5print("equal")6else:7print("small")
  5. 5

    What does this program print?

    1word = "KEYBOARD"2print(word[2] + word[-1])
  6. 6

    What does this program print?

    1word = "COMPUTER"2print(word[3] + word[-1])
  7. 7

    What does this program print?

    1word = "NETWORK"2print(word[3] + word[-1])
  8. 8

    What does this program print?

    1total = 02for i in range(1, 5):3total = total + i * 24print(total)
  9. 9

    What does this program print?

    1total = 02for i in range(1, 6):3total = total + i * 14print(total)
  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?

    1word = "ALGORITHM"2print(word[2] + word[-1])
  12. 12

    What does this program print?

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

★ Challenge corner for fast finishers

6 computers each connect directly to every other computer with one cable. How many cables are needed?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/12/code_tracing

Answer key (click to show)
  1. 1.big
  2. 2.AM
  3. 3.MR
  4. 4.small
  5. 5.YD
  6. 6.PR
  7. 7.WK
  8. 8.20
  9. 9.15
  10. 10.30
  11. 11.GM
  12. 12.28
  13. ★15 (challenge corner)

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