My Plates

Plates

In NSW, home to Killarney Heights High School, it’s possible to request custom license plate for your vehicle, with your choice of letters and numbers instead of random ones. There are few requirements for custom license plates apart from offensive words and profanity.

Some countries have requirements like the following:

"All plates must start with at least two letters."
“plates may contain a maximum of 6 characters (letters or numbers) and a minimum of 2 characters.”
“Numbers cannot be used in the middle of a plate; they must come at the end. For example, AAA222 would be an acceptable plate; AAA22A would not be acceptable. The first number used cannot be a ‘0’.”
“No periods, spaces, or punctuation marks are allowed.”

In plates.py, implement a program that prompts the user for a number plate and then output Valid if meets all of the requirements or Invalid if it does not. Assume that any letters in the user’s input will be uppercase. Structure your program per the below, wherein is_valid returns True if s meets all requirements and False if it does not. Assume that s will be a str. You’re welcome to implement additional functions for is_valid to call (e.g., one function per requirement).

def main():
    plate = input("Plate: ")
    if is_valid(plate):
        print("Valid")
    else:
        print("Invalid")


def is_valid(s):
    ...


main()

Hints

Recall that a str comes with quite a few methods, per docs.python.org/3/library/stdtypes.html#string-methods.
Much like a list, a str is a “sequence” (of characters), which means it can be “sliced” into shorter strings with syntax like s[i:j]. For instance, if s is "CS50", then s[0:2] would be "CS".

Before You Begin

From the root of your repository execute cd src/loops So your current working directory is ...

src/loops $:

Next execute

code plates.py

to make a file called plates.py where you’ll write your program.

How to Test

Here’s how to test your code manually:

Run your program with python plates.py. Type CS50 and press Enter. Your program should output:
```
Valid
```
Run your program with python plates.py. Type CS05 and press Enter. Your program should output:
```
Invalid
```
Run your program with python plates.py. Type CS50P and press Enter. Your program should output
```
Invalid
```
Run your program with python plates.py. Type PI3.14 and press Enter. Your program should output
```
Invalid
```
Run your program with python plates.py. Type H and press Enter. Your program should output
```
Invalid
```
Run your program with python plates.py. Type OUTATIME and press Enter. Your program should output
```
Invalid
```

Pytest

You can execute the below to check your code using pytest from the root directory.

pytest .\tests\loops\plates.py

A green output from running the test means it was successful. A red output means there is a bug in your code that you need to fix.

How to Submit

From github desktop or the command line, commit your changes and push them to your repository.

Codespaces

If you are using codespaces, you can commit your changes directly from the Codespace interface. Click on the Source Control icon in the left sidebar, then click on the "..." button and select "Commit to main". Enter a commit message and click "Commit".

Codespace terminal or your local terminal.

Note

You will need to have installed git-scm for this to work locally

At the /datatypes $ prompt in your terminal:

git add -A

Add all changed files in the repository to be committed

git commit -m "your message here"

Commit all changes in the REPO with the comment “your message here“ note: If the file is not complete, adjust the comment to describes what is being committed

Note

Remember to replace "your message here" with a meaningful commit message that describes your changes.

git push

Push all changes to the repo.