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Writing Four Functions to Perform Different Arithmetic Operations in Python
In this hands-on lab, we will attempt to write four functions that will perform different arithmetic operations: addition, subtraction, multiplication, and division.

Lab Info
Table of Contents
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Challenge
Create a File and Make It Executable
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Create the file:
touch myFile.py
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Make it executable:
chmod +x myFile.py
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Challenge
Write Three Functions That Are Able to Add, Subtract, and Multiply Two Numbers
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Open the file:
vim myFile.py
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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
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Challenge
Write a Function to Divide Two Numbers and Implement a Check for Division by 0
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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
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Challenge
Run Tests and Call All Four Functions
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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))
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Save and exit the file by pressing Escape followed by
:wq
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Call all four functions:
./myFile.py
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About the author
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