• Due
• What You Need to Do
• Setup On Your Machine
• Specification
• Functions
• Test Code
• Output
• Suggestions
• Testing on Your Machine
• Copy the Script to Unix
• Testing the Script on Unix (Optional)

Due

Sunday, April 12th at 11:59 PM

What You Need to Do

• Create the script hw10.py
• Make sure it obeys the rules in Rules for Homework Scripts
• Make sure the script has a hashbang line and is executable
• Move it to an an hw10 directory on pe15.cs.umb.edu

Setup On Your Machine

• Open a text editor.
  I would suggest the text editor built into the program IDLE.
• Save the file as hw10.py
• Using FileZilla, copy the file id_scores.txt from /home/ghoffman/course_files/it116_files to the directory on your machine that holds hw10.py
  

Specification

• This script will read a file with student IDs and exam scores and compute the average, median, highest and lowest scores
• The data in the file looks like this

  07128669	76
  09423988	88
  07765600	94
  ...

• In this assignment you will work with the data in this file using lists
• The script must contain 3 functions
  • scores_list_create
  • scores_average
  • highest_lowest_scores

Functions

scores_list_create

• Header

  def scores_list_create(file):

• The function has one parameter, file, a file object
• This function reads in a file containing values for student_id and score and returns a list of scores
• The score values must be integers
• The function should use the following algorithm

	create an empty list
	for each line in the file:
	   set values for id and score using split()
	   turn score into an integer
	   add score to the list 
	return  the list

scores_average

• Header

  def scores_average(list):

• This function has one parameter, list, a list of integers
• The function must read in the list with a for loop to get the score
• It must return the average score, rounded to an integer
• The function should use the following algorithm

	set total to 0
	for each value in the list:
	   add the value to total
	find the average by dividing total by the length of the list
	return the average using round to turn it into an integer

highest_lowest_scores

• Header

  def highest_lowest_scores(list):

• This function has one parameter, list, a list of integers
• The function must return the highest and lowest scores in a list of numbers
• The function should use the following algorithm

	
	return the highest and lowest values in the list using max & min

Test Code

• Your script must contain the following statements

  FILENAME = "id_scores.txt"
  file = open(FILENAME, "r")
  scores_list = scores_list_create(file)
  print(scores_list)
  average = scores_average(scores_list)
  print(average)
  highest_lowest_scores(scores_list)
  highest, lowest = highest_lowest_scores(scores_list)
  print(highest, lowest)

• They should appear at the bottom of your script

Output

• The output should look something like this

  [76, 88, 94, 98, 40, 70, 47, 68, 93, 49, 69, 91, 75, 95, 52, 91, 71, 47, 56, 66, 
   71, 90, 61, 58, 90, 96, 67, 83, 77, 90, 51, 64, 61, 53, 74, 89, 99, 42, 86]
  73
  99 40

Suggestions

• Write this script in stages
• Test your script at each step
• Print the steps below
• And check them off as you finish each one

1. Create a hashbang line on the first line of the script.
   Copy only the function headers for the four functions listed above into your script file.
   Under each header, write pass.
   Make sure this statement is indented.
   Run the script.
   Fix any errors you find.
2. Remove the pass from scores_list_create.
   Create a an empty list.
   Write a for loop that prints every line in the file.
   Copy all of the test code to the bottom of your script.
   Comment out all but the first three lines of the test code.
   Do this by inserting # at the beginning of the line.
   Run the script.
   Fix any errors you find.
3. Remove the print statement.
   Replace it with a statement that calls split on the line to assign values to the variables id and score.
   Print id and score.
   Run the script.
   Fix any errors you find.
4. Remove the print statement.
   Replace it with an assignment statement that turns score into an integer using int().
   Append score to the list.
   Outside the for loop, print the list.
   Run the script.
   Fix any errors you find.
5. Remove the print statement.
   Replace it with a statement that returns the list.
   Uncomment the next line in the test code.
   Run the script.
   Fix any errors you find.
6. Remove the pass statement from scores_average.
   Replace it with a statement that sets total to 0.
   Write a for loop that prints each value in the list.
   Uncomment the next line in the test code.
   Run the script.
   Fix any errors you find.
7. Remove the print statement.
   Replace it with a statement that adds score to total.
   Outside the for loop print total.
   Run the script.
   Fix any errors you find.
8. Remove the print statement.
   Replace it with a statement that calculates average by dividing total by the length of the list.
   Use an assignment statement to make average an integer using round.
   Return average.
   Uncomment the next commented line in the test code.
   Run the script.
   Fix any errors you find.
9. Remove the pass statement from highest_lowest_scores.
   Find the highest and lowest values using max and min.
   Return thses values Uncomment the last three lines in the test code.
   Run the script.
   Fix any errors you find.

Testing on Your Machine

• Open IDLE
• Use the Open command in IDLE to open hw10.py
• Run your script inside IDLE
• Your output should look something like this

  [76, 88, 94, 98, 40, 70, 47, 68, 93, 49, 69, 91, 75, 95, 52, 91, 71, 47, 56, 66, 
   71, 90, 61, 58, 90, 96, 67, 83, 77, 90, 51, 64, 61, 53, 74, 89, 99, 42, 86]
  73
  99 40

Copy the Script to Unix

• Open FileZilla and connect to pe15.cs.umb.edu
• Go to your it116 directory
• Go to your hw directory
• Right-click in the whitespace inside the hw directory
• Enter hw10 in the dialog box
• Click and drag your script from the bottom left panel to the bottom right panel
• Right-click on the file and select "Permissions" from the menu
• Enter 755 in the box provided
• This will make the script executable
• Click and drag id_scores.txt from the bottom left panel to the bottom right panel

Testing the Script on Unix (Optional)

• Connect to pe15.cs.umb.edu using an ssh client like putty.exe (Windows) or ssh (Mac)
• Go to the directory for this exercise

  cd  it116/hw/hw10

• Run this script

  ./hw10.py

• You should see something like this

  [76, 88, 94, 98, 40, 70, 47, 68, 93, 49, 69, 91, 75, 95, 52, 91, 71, 47, 56, 66, 
   71, 90, 61, 58, 90, 96, 67, 83, 77, 90, 51, 64, 61, 53, 74, 89, 99, 42, 86]
  73
  71
  99 40

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