Lesson 5.7 · Trace it
Trace: double loop
Python code9 rows to fill4 marks
Complete the trace table for this Python code. for x in nums gives x each value of nums in turn. [4]
Line 1: nums = [4, 1, 3]Line 2: for x in nums:Line 3, indented 1 level: x = x * 10Line 4: first = nums[0]Line 5: for i in range(len(nums)):Line 6, indented 1 level: nums[i] = nums[i] + 1Line 7: last = nums[2]Line 8: print(first + last)
Fill in one row each time a line changes x, first or last, or prints something. The table already has the right number of rows. In each row, write only what that line changes; you can leave the other cells empty or copy their values down. Write values the way Python shows them: 3 and 3.0 are different, and text goes in quotes. In the output column, write exactly what appears on screen, with no quotes around it.
| Row | x | first | last | output |
|---|---|---|---|---|
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 | ||||
| 6 | ||||
| 7 | ||||
| 8 | ||||
| 9 |