10.10. Chapter Exercises

Complete the code to create a program that adds up all the numbers from 10 to 20. Make sure to include both 10 and 20 in the sum.

sum = _____________ for number in _____________: sum = sum + _____________ print(sum) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(sum, 165, "Testing that you got the right sum") self.assertNotRegex(self.getEditorText(), "165", "Testing that you did not hard code the answer.") myTests().main()

Complete the code to calculate the sum of the squares of all numbers from 1-10 (inclusive). The sum of squares is the result of squaring each value before adding it to the sum. The sum of squares for the numbers 1-4 would be \(1 * 1 + 2 * 2 + 3 * 3 + 4 * 4 = 30\).

It might help to calculate each square and print it out before adding it to the sum to make sure you are using the right values.

sum = _____________ # More code here print(sum) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(sum, 385, "Testing that you got the right sum") self.assertNotRegex(self.getEditorText(), "385", "Testing that you did not hard code the answer.") myTests().main()

The following program calculates the height of an object as it falls from 1000 feet. The program should use a loop to print out the current height, then update the time by one second and calculate a new height. It should stop looping once the object reaches the ground (height 0) and then print out the final number of seconds.

Put the blocks in the right order and indentation. As usual, you will not use all the blocks.

        ---
initial_height = 1000
current_height = initial_height
time = 0
---
while current_height > 0:
---
while current_height == 0: #paired
---
    print("After", time, "seconds")
    print("height is", current_height)
---
    time = time + 1
---
    time + 1 #paired
---
    # height = starting - 16.87*t^2
    current_height = initial_height - 16.87 * (time ** 2)
---
print("After", time, "seconds)
print("the object is on the ground")
        

To count how many digits there are in a number, you can do the following:

while the number is greater than 0
    set the number to the number divided by 10 (ignore any remainder)
    add one to the number of digits

Below is a function digitsIn that is supposed to calculate the number of digits in A given number. You need to write the logic to calculate that.

Hint: when you divide number by 10, make sure to use // to do whole number division.

Remember the debugging tricks you used - use codelens or print out values to make sure your work is correct.

def digitsIn(number): digits = 0 # add code here! #while the number is greater than 0 # set the number to the number divided by 10 (use // to divide) # add one to the number of digits return digits print( "Should be 3 digits in 294", digitsIn(294) ) print( "Should be 5 digits in 83163", digitsIn(83163) ) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(digitsIn(8), 1, "Testing digitsIn(8) is equal to 1") self.assertEqual(digitsIn(294), 3, "Testing digitsIn(294) is equal to 3") self.assertEqual(digitsIn(1234), 4, "Testing digitsIn(1234) is equal to 4") myTests().main()

Below is the start of a program to calculate how long it will take to have at least $50,000 if you invest $300 per month at 0.5% interest per month (approximately 6% per year).

You should add code to continue doing the following until money reaches 50000:

• Increase the existing money by 0.5% (multiply it by 1.005). (This is interest earned on all money already invested.)

• Add the monthly investment amount to money. (This is another month of investment.)

• Increase the months count by 1

Remember the debugging tricks you used - use codelens or print out values to make sure your work is correct.

money = 0 invest_per_month = 300 months = 0 # TODO # repeat WHILE the money is less than 50000 # gain 0.5% interest to the money (set money to itself times 1.005) # add the invest_per_month to the money # increase the months by 1 print(months) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(months, 122, "Testing you calculated the right answer.") self.assertNotRegex(self.getEditorText(), "122", "Testing that you did not hard code the answer.") myTests().main()

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