Using Python Conditionals

We'll create a fizz-buzz-item.py right in our home directory (~), and we want to make sure that we can run it directly, so that we're not completely tied to the path of our python3.7 binary. We can do this by writing our shebang properly.

Let's create the file and set the shebang:

~/fizz-buzz-item.py

#!/usr/bin/env python3.7

# Python implementation here

With the file created, we need to also make sure that it's executable. We'll do that using chmod:

$ chmod u+x ~/fizz-buzz-item.py

Next, we'll prompt the user for a value, convert it to an int, and store it off in a variable:

~/fizz-buzz-item.py

#!/usr/bin/env python3.7

value = int(input("Enter an integer value: "))

With the value read, we can create our conditional. Since we have a case that should trigger if the value is a multiple of three and five, then we'll want that branch to be before the only multiple of three or only multiple of five branches, because either of those would also be true. Let's create our if statement and print "FizzBuzz" if the condition is met, then add an else to just print the value otherwise:

~/fizz-buzz-item.py

#!/usr/bin/env python3.7

value = int(input("Enter an integer value: "))

if value % 5 == 0 and value % 3 == 0:
    print("FizzBuzz")
else:
    print(value)

Now we can run the script to make sure that what we've written up to this point is working properly:

$ ./fizz-buzz-item.py
Enter an integer value: 15
FizzBuzz
$ ./fizz-buzz-item.py
Enter an integer value: 4
4
$

To handle the other two cases of the Fizz-Buzz problem we'll need to utilize elif statements for each of the individual comparisons that we used in our if statement. Let's add those now:

~/fizz-buzz-item.py

#!/usr/bin/env python3.7

value = int(input("Enter an integer value: "))

if value % 5 == 0 and value % 3 == 0:
    print("FizzBuzz")
elif value % 3 == 0:
    print("Fizz")
elif value % 5 == 0:
    print("Buzz")
else:
    print(value)

Now we can run the script to make sure that what we've written up to this point is working properly:

$ ./fizz-buzz-item.py
Enter an integer value: 15
FizzBuzz
$ ./fizz-buzz-item.py
Enter an integer value: 4
4
$ ./fizz-buzz-item.py
Enter an integer value: 6
Fizz
$ ./fizz-buzz-item.py
Enter an integer value: 10
Buzz
$