ECOR 1041 Lab 3 Solutions

Using a text editor, type your solutions to the exercises in the lab instructions (file ECOR1041_Lab3.pdf) in the indicated areas.

=========== Exercise 1:

(a) Write the Python statement that caused the variable degrees_f to appear in the memory model

==> Replace this line with your answer to (a).

(b) What is the name of the frame containing degrees_f?

==> Replace this line with your answer to (b).

(c) What does the arrow that points from degrees_f to 70 represent?

==> Replace this line with your answer to (c).

(d) Write the Python statement that caused the variable degrees_k to appear in the memory model.

==> Replace this line with your answer to (d).

(e) The arrow in degrees_k points to an object. What is the type and value of this object?

==> Replace this line with your answer to (e).

=========== Exercise 2:

Copy the four assignment statements from Python Tutor and paste them between the two dashed lines. -------------------------------- ==> Replace this line with the first statement. ==> Replace this line with the second statement. ==> Replace this line with the third statement. ==> Replace this line with the fourth statement. --------------------------------

(a) What is the name of the first variable that appears in the memory model? What is the type and value of the object that it refers to?

==> Replace this line with your answer to (a).

(b) What is the name of the second variable that appears in the memory model? What is the type and value of the object that it refers to?

==> Replace this line with your answer to (b).

(c) What is the name of the third variable that appears in the memory model? What is the type and value of the object that it refers to?

==> Replace this line with your answer to (c).

(d) What is the name of the fourth variable that appears in the memory model? What is the type and value of the object that it refers to?

==> Replace this line with your answer to (d).

=========== Exercise 3:

Copy the five assignment statements from Python Tutor and paste them between the two dashed lines. -------------------------------- ==> Replace this line with the first statement. ==> Replace this line with the second statement. ==> Replace this line with the third statement. ==> Replace this line with the fourth statement. ==> Replace this line with the fifth statement. --------------------------------.

=========== Exercise 4:

Write a short step-by-step explanation of how Python evaluates the statement:

x *= x + x

when x is refers to 5.