Example from the book. Variable differs but works! Why?

Question

https://code.sololearn.com/cg9EMVsOl6HG/#py

Can Python understand itself define plural or not?

Answer 1

you could use any combination of letters there. example:

for vwl in found:
print(vwl)

here vwl is used locally, in the for loop.

So, no, Python does not know plural but uses the variable u defined.