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

Due

Sunday, February 18th at 11:59 PM

What You Need to Do

• Create the script hw4.py
• Make sure it obeys the rules in Rules for Homework Scripts
• Move it to an an hw4 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 hw4.py

Specification

• Exoplanets are planets that orbit stars other than the sun
• Starting in the 1990s many exoplanets have been discovered
• There are many different kinds of exoplanets, but astronomers assign them into categories based on their size relative to Earth
• Write a script that will take a multiple of the size of the Earth and return the type for that size
• The type of exoplanet is given by the following table

  Type	Size Relative to Earth
  Terrestrial	<= 1.25 Earths
  Super-Earth	<= 2 Earths
  Neptune-like	<= 6 Earths
  Gas Giant	> 6 Earths

Output

• The output should look something like this

  Earths: 2
  Super-Earth

• The text in blue is what the user enters

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. Write an assignment statement using the input function that asks the user for the diameter and gives this value to the variable diameter.
   Convert this value to an decimal using float().
   Print the value.
   Run the script.
   Fix any errors you find.
2. Remove the print statement you wrote in the previous step.
   Replace it with an if statement that will run if the value of diameter is less than or equal to 1.25.
   Inside this if clause, assign type the value "Terrestrial".
   Outside this if statement, print the value of type.
   Run the script.
   Fix any errors you find.
3. Add an elif clause under the if statement that will run if the value of diameter is less than or equal to 2.
   Inside this clause set the value of type to "Super-Earth".
   Run the script.
   Fix any errors you find.
4. Repeat the above step for the type "Neptune-like".
5. Add an else clause that sets the value of type to "Gas Gian".
   Run the script.
   Fix any errors you find.

Testing on Your Machine

• Open IDLE
• Use the Open command in IDLE to open hw4.py
• Run your script inside IDLE
• Your output should look something like this

  Earths: 2
  Super-Earth

• The text in blue is what you enter at the command line
• You should test your script with the following values to make sure your script works for all types

  1
  1.25
  1.26
  2
  2.01
  6
  6.01

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 hw4 in the dialog box
• Click and drag your script 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/hw4

• Run this script

  python3 hw4.py

• You should see something like this

  Earths: 2
  Super-Earth

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

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