Lab
A Cloud Guru

Using Python Conditionals

The majority of programs that we write will need to be more than a single sequential path of execution. We usually work with data that isn't always the same, and occasionally requires us to do different things based on that data. To achieve this we need to utilize conditionals. In this hands-on lab, we'll work through the conditional logic for the popular interviewing Fizz-Buzz problem by creating a script that will prompt the user for a number and then print out either the number, "Fizz", "Buzz", or "FizzBuzz" depending on whether the number meets one of the Fizz-Buzz requirements. To feel comfortable completing this lab you'll want to know how to do the following: * Utilize conditionals. Watch the "The `if` and `else` Statements" and "Handling Multiple Cases with `elif`" videos from the Certified Entry-Level Python Programmer Certification course. * Handle user input. Watch the "The `input` Function" video from the Certified Entry-Level Python Programmer Certification course.

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Path Info

Level

Beginner

Duration

30m

Published

Nov 26, 2019

Challenge

Create the fizz-buzz-item.py Script, Make It Executable with python3.7, and Accept User Input
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: "))
```
Challenge

Print "FizzBuzz" if the Value Is a Multiple of Three and Five
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
$
```

Challenge

Print "Fizz" if the Value Is a Multiple of Three, and "Buzz" if it's a Multiple of Five

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
$

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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