Simple Assignments — Runestone Interactive Overview

Write code to create a variable score and make it refer to the integer 1. ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(score, 1) self.assertIs(type(score), int, "variable must refer to an int") myTests().main()

Remember that an assignment is a = with a variable on the left-hand side and a value or expression on the right-hand side.

score = 1

Write code to create a variable temperature and make it refer to a floating point number. ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertIs(type(temperature), float, "variable must refer to a float") myTests().main()

A floating point number is a real number. I.e., it has a . in it.

temperature = 57.3

Write code to create a variable name and make it refer to a string. ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertIs(type(name), str, "variable must refer to a string") myTests().main()

A string is enclosed by single or double quotes.

name = "Desmond Tutu"

Write code to create a variable matches and make it refer to a boolean value. ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertIs(type(matches), bool, "variable must refer to a boolean") myTests().main()

The two booleans values are True and False.

matches = False

Assume the variable temperature has been initialized to some value. Write code to add 1 to the variable temperature. # replace this comment with your code ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertAlmostEqual(temperature, 58.3) myTests().main()

The right-hand side of an equation is evaluated first, so you can take temperature and add 1 to it on the right-hand side, and then put temperature on the left-hand side of the = sign.

temperature = temperature + 1 # Also, could be written temperature += 1

Assume you have two variables hours and hourly_rate. Write code to compute the total_pay, by multiplying hours and hourly_rate and storing in total_pay. # Assume hours and hourly_rate have been defined and given values. # replace this comment with your code ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertAlmostEqual(total_pay, hours * hourly_rate) myTests().main()

Multiply hours and hourly_rate on the right-hand side of the assignment statement.

total_pay = hours * hourly_rate

Assume you have two variables p1_points and p2_points. Write a line of code to indicate that player p1 added all of player p2’s points to her own. # replace this comment with your code ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertAlmostEqual(p1_points, 61) self.assertAlmostEqual(p2_points, 44) myTests().main()

Your code needs to add p2_points to p1_points and make p1_points refer to the result.

p1_points = p1_points + p2_points # or p1_points = p2_points + p1_points

Assume you have a variable ball1_direction. Write a line of code that set ball2’s direction to be the same as ball1’s direction. # replace this comment with your code ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertAlmostEqual(ball2_direction, ball1_direction) self.assertAlmostEqual(ball1_direction, 17) myTests().main()

Your code creates variable ball2_direction on the left-hand side of the = sign and sets it value to ball1_direction.

ball2_direction = ball1_direction

Replace these statements with a single statement so that you don’t use the variable y – just the variable x being set to a value.

x = 7 y = x + 1 x = y ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertAlmostEqual(x, 8) myTests().main()

x = 8

Before running the following code, predict what value will be printed.

x = 7 y = 9 y = x x = 4 print(y)

If you don’t understand the answer, using CodeLens might help.

Simple Assignments¶