Table of Contents

1. Challenge

   Create a File and Make It Executable

   1. Create the file:

      touch myFile.py
      

   2. Make it executable:

      chmod +x myFile.py
      

2. Challenge

   Write Three Functions That Are Able to Add, Subtract, and Multiply Two Numbers

   1. Open the file:

      vim myFile.py
      

   2. Add the following to the file:

      #!/usr/bin/python
      
      def add(n1, n2):
          return n1+n2
      def sub(n1, n2):
          return n1-n2
      def multi(n1, n2):
          return n1*n2
      

3. Challenge

   Write a Function to Divide Two Numbers and Implement a Check for Division by 0

   1. Add the following to the file:

      def div(n1, n2):
          if n2 == 0:
              return "ERROR: Cannot divide by 0. Second parameter cannot be a 0!"
          else:
            return n1/n2
      

4. Challenge

   Run Tests and Call All Four Functions

   1. Add the following to the file:

      n1 = 10
      n2 = 11
      
      print(add(n1, n2))
      print(sub(n1, n2))
      print(multi(n1, n2))
      print(div(n1, n2))
      n2 = 0
      print(div(n1, n2))
      

   2. Save and exit the file by pressing Escape followed by :wq.

   3. Call all four functions:

      ./myFile.py