Encoding base-62 what's the catch?

Question

Python

I found an interesting library that generates graphics in the form of svg/png images.
The question remained open how exactly to decode the strings that are in the examples in order to understand exactly how to encode in base-62 thanks. LINK

Answer 1

So there is a completely understandable example, the Data Encoding section.
The entire range of values ​​[Ymin, Ymax] is mapped to the interval [0, 61], then for each value the character corresponding to the interval is taken