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Grade 6 · unit review

Review: Build Programs with Text and Lists

For text="planet" and values=[4,8,3], find text[1:4],values[1] and len(values). Explain the excluded slice endpoint.

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Unit review questions
1. Paper Python 3 expression: "music"[2]. What value results?
Need a hint?
  • Label characters from index 0 and select the stated position.
  • Index 1 selects the second character, not the first.
2. Paper Python 3 expression: "marker"[0:4]. What value results?
Need a hint?
  • Include the start index and stop before the stated stop index.
  • Do not include the stop-position character.
3. Paper Python 3 expression: [8,5,1,9][2]. What value results?
Need a hint?
  • Number list positions from 0 and return the value at the stated index.
  • The smallest value is not necessarily the first list item.
4. Paper Python 3 expression: len([[],[1],[]]). What value results?
Need a hint?
  • Count the elements directly inside the outer sequence.
  • Do not replace list length with the sum of its values.

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Use the skills in a new task

For text="planet" and values=[4,8,3], find text[1:4],values[1] and len(values). Explain the excluded slice endpoint.

Work on paper or in your own document. Explain the choices you made.

  • Use only supplied fictional inputs and state the relevant rule.
  • Include labeled steps or evidence for each decision.
  • Name one limitation or tempting mistake.
  • Check that the result meets the task and revise a justified error.
Compare with a model response

text[1:4] yields "lan" at indices 1,2,3; index 4 is excluded. values[1] is 8 and len(values) is 3, not 15. I preserve the given order rather than sorting first.

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