How to convert special characters into HTML entities?

Question

I want to convert an arbitrary text into a text with the corresponding HTML-entities and I am searching for a dedicated Python module + method for replacing the special characters into HTML-entities.
E.g. the conversion should be like
ä -> ä
ö -> ö
ü -> ü
ß -> ß
I could do this for a couple of characters with a dictionary, but I want to have a comprehensive solution which covers all available characters outside the standard character set a-z and A-Z for many different languages.
In the attached file https://code.sololearn.com/cn9CBAh8mLff/?ref=app where I use XML, the '<'-character is automatically converted into its entity &lt;. Why does this not occur with the characters 'äöü'?
How would I have to proceed to solve this?

Answer 1

I don't know it is correct answer or not.
Find starting and ending number for all characters.
from https://html-css-js.com/html/character-codes/
then use for loop to get all characters.
https://code.sololearn.com/WcB3dPe9TxHg/?ref=app