Tracing Guide

The ability to trace your code is essential for debugging. Given some arbitrary Python code, you should always be able to answer the questions:

• What line gets executed next?
• What is the current state of memory? In other words, which values are currently assigned to which variables?

Instructions

Trace the execution of a program by filling in a tracing table.

1. In Step, number the step of execution.
2. In Memory State, show the values of all variables currently in memory after the line has executed, e.g., x: 5
3. In Next Line, write down the next line of code that will execute, e.g., 2.
4. In Output, write down any text if any, that will be printed.

Tracing table:

Step	Memory State	Next Line	Output

Example 1

Step	Memory State	Next Line	Output
1	x: 5	2
2	x: 5, y: 10	3
3	x: 5, y: 10, sum: 15	4
4	x: 5, y: 10, sum: 15	Done	The sum is 15

Example 2

Step	Memory State	Next Line	Output
1	x: 5	2
2	x: 5	4
3	x: 5	5
4	x: 5, result = "Odd"	6
5	x: 5, result = "Odd"	Done	Odd

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