• 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, November 22nd 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 temps_max_min.txt from /home/ghoffman/course_files/it116_files to the directory on your machine that holds hw10.py
  

Specification

• This script will read in a file where each line has a date and the maximum and minimum temperatures for that date
• The file has entries like this

  2017-06-01 67 62
  2017-06-02 71 70
  2017-06-03 69 65

• The script creates a list of lines from this file
• This list is used to print each date and its average temperature
• It also find the date with the highest temperature
• It will then find the highest average temperature
• The script must contain 3 functions
  • list_from_file
  • date_average_temp
  • higest_temp
• Average temperatures MUST be integers

Functions

list_from_file

• Header

  def list_from_file(file):

• This function takes one parameter, file, a file object for reading
• It should use the following algorithm

  create an empty list
  for each line in the file:
     add the line to the list
  return the list

date_average_temp

• Header

  def date_average_temp(lines):

• This function has one parameter, lines, a list of lines
• If will loop through the list calculating the average for each date
• It will then print the date and rounded average
• It should use the following algorithm

  for each line in the list
      get the date, maximum and minimum temperatures
      convert max into an integer
      convert min into an integer
      calcuate aver by adding max and min and dividing by 2
      print the date and the rounded average

highest_temp_date

• Header

  def highest_temp_date(lines):

• This function has one parameter, lines, a list of lines
• It will loop through the list to find the highest temperature and the date on which it occurred
• It will then return the highest temperature and date
• It should use the following algorithm

  set highest_temp to -500
  set highest_date to the empty string
  for each line in the list
  	get the date, maximum and minimum temperatures
  	convert max into an integer
  	if max is greater than highest_temp 
  		set highest_temp to max
  		set highest_date to date
  return highest_temp and highest_date
          

Test Code

• Your script must contain the following statements

  file  = open("temps_max_min.txt","r")
  lines = list_from_file(file)
  date_average_temp(lines)
  highest_temp_date(lines)
  max_temp, max_date = highest_temp_date(lines)
  print()
  print(max_temp, max_date)

• They should appear at the bottom of your script

Output

• The output should look something like this

  2017-06-01 64
  2017-06-02 70
  2017-06-03 67
  2017-06-04 84
  ...
  
  89 2017-06-24

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 the script hw10.py.
   Copy the three function headers into your script.
   For the body of these functions, use the pass statement.
   Run the script.
   Fix any errors you find.
2. Remove the pass statement from list_from_file.
   Create the empty list lines.
   Write a for loop over the parameter, file.
   Inside the loop print each line.
   Copy the test code to the bottom of the script.
   Comment out all but the first two lines of the test code.
   Run the script.
   Fix any errors you find.
3. Remove the print statement.
   In its place write a statement that appends line to lines.
   Outside the for loop print lines.
   Run the script.
   Fix any errors you find.
4. Remove the print statement.
   Replace it with a statement that returns lines.
   Remove the pass statement from date_average_temp.
   Replace it with a statement the prints the parameter lines.
   Uncomment the 3rd line in the test code that calls date_average_temp.
   Run the script.
   Fix any errors you find.
5. Remove the print statement.
   Replace it with a for loop that prints evey line in lines.
   Run the script.
   Fix any errors you find.
6. Remove the print statement.
   Replace it with a single assignment statement that sets the variables date, max and min with the result of calling split on line.
   Print date, max and min.
   Run the script.
   Fix any errors you find.
7. Remove the print statement.
   Write an assignment statement that turns max into an integer.
   Do the same for min.
   Calculate ave by adding max and min and dividing the total by 2.
   Print date and the rounded value of aver.
   Run the script.
   The first three lines should be

   2017-06-01 64
   2017-06-02 70
   2017-06-03 67

   Fix any errors you find.
8. Remove the pass statement from higest_temp_date.
   Replace it with an assignment statement that sets highest_temp to -500.
   Add an assignment statement that sets highest_date to the empty string.
   Write a for loop that prints each line in lines.
   Uncomment the 4th line in the test code that calls highest_temp_date(lines).
   Run the script.
   Fix any errors you find.
9. Remove the print statement.
   Replace it with a single assignment statement that sets the variables date, max and min with the result of calling split on line.
   Print date, max and min.
   Run the script.
   Fix any errors you find.
10. Remove the print statement.
    Replace it with an assignment statement that turns max into an integer.
    Print date and max.
    Run the script.
    Fix any errors you find.
11. Remove the print statement.
    Write an if statement that asks whether max is greater than highest_temp.
    If it is, set highest_temp to max and print highest_temp.
    Run the script.
    Fix any errors you find.
12. Remove the print statement.
    Replace it with an assignment statement that sets highest_date to date.
    Outside the for loop, return highest_temp and highest_date.
    Uncomment the last 3 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

• The text in blue is what you enter at the command line

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 temps_max_min.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

• The text in blue is what you enter at the command line

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