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Challenge 115: Markdown Ordered List Item Converter

curriculum/challenges/english/blocks/daily-coding-challenges-python/69162d64f96574d9bb629f00.md

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--description--

Given a string representing an ordered list item in Markdown, return the equivalent HTML string.

A valid ordered list item in Markdown must:

  • Start with zero or more spaces, followed by
  • A number (1 or greater) and a period (.), followed by
  • At least one space, and then
  • The list item text.

If the string doesn't have the exact format above, return "Invalid format". Otherwise, wrap the list item text in li tags and return the string.

For example, given "1. My item", return "<li>My item</li>".

Note: The console may not display HTML tags in strings when logging messages. Check the browser console to see logs with tags included.

--hints--

convert_list_item("1. My item") should return "<li>My item</li>".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item("1. My item"), "<li>My item</li>")`)
}})

convert_list_item(" 1. Another item") should return "<li>Another item</li>".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item(" 1.  Another item"), "<li>Another item</li>")`)
}})

convert_list_item("1 . invalid item") should return "Invalid format".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item("1 . invalid item"), "Invalid format")`)
}})

convert_list_item("2. list item text") should return "<li>list item text</li>".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item("2. list item text"), "<li>list item text</li>")`)
}})

convert_list_item(". invalid again") should return "Invalid format".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item(". invalid again"), "Invalid format")`)
}})

convert_list_item("A. last invalid") should return "Invalid format".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(convert_list_item("A. last invalid"), "Invalid format")`)
}})

--seed--

--seed-contents--

py
def convert_list_item(markdown):

    return markdown

--solutions--

py
import re
def convert_list_item(markdown):
    match = re.match(r'^\s*(\d+)\.\s+(.+)$', markdown)
    if not match:
        return "Invalid format"
    text = match.group(2)
    return f"<li>{text}</li>"