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Match

Let's take another look at our example Enum from the previous lessons:

from enum import Enum


class Color(Enum):
    RED = 1
    GREEN = 2
    BLUE = 3

Working With Enums

Python has a match statement that tends to be a lot cleaner than a series of if/elif/else statements when we're working with a fixed set of possible values (like a sum type, or more specifically an enum):

def get_hex(color: Color) -> str:
    match color:
        case Color.RED:
            return "#FF0000"
        case Color.GREEN:
            return "#00FF00"
        case Color.BLUE:
            return "#0000FF"

        # default case (invalid Color)
        case _:
            return "#FFFFFF"

If you have two values to match, you can use a tuple:

class Shade(Enum):
    LIGHT = 1
    DARK = 2


def get_hex(color: Color, shade: Shade) -> str:
    match (color, shade):
        case (Color.RED, Shade.LIGHT):
            return "#FFAAAA"
        case (Color.RED, Shade.DARK):
            return "#AA0000"
        case (Color.GREEN, Shade.LIGHT):
            return "#AAFFAA"
        case (Color.GREEN, Shade.DARK):
            return "#00AA00"
        case (Color.BLUE, Shade.LIGHT):
            return "#AAAAFF"
        case (Color.BLUE, Shade.DARK):
            return "#0000AA"

        # default case (invalid combination)
        case _:
            return "#FFFFFF"

The values after match (color and shade) are compared against enum members in each case (Color.RED and Shade.LIGHT). If a match is found, the code in the block is executed.

Assignment

Complete the convert_format function. Using the enum DocFormat, it should support 3 types of conversions:

From MD to HTML:
- Assume the content is a single h1 tag in Markdown syntax – one string representing one line. Replace the leading # with an <h1> and add a </h1> to the end.
- Example: # This is a heading → <h1>This is a heading</h1>
From TXT to PDF:
- Simply add a [PDF] tag to the beginning and end of the content.
- Notice the spaces between [PDF] tags and the content: This is some text → [PDF] This is some text [PDF]
From HTML to MD:
- Replace any <h1> tags with # and remove any </h1> tags.
- Example: <h1>This is a heading</h1> → # This is a heading
Any other conversion:
- If the input format is invalid, raise an Exception:
```
invalid type
```