Writing Four Functions to Perform Different Arithmetic Operations in Python

Create the file:

touch myFile.py

Make it executable:

chmod +x myFile.py

Open the file:

vim myFile.py

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

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

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))

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

Call all four functions:

./myFile.py