Save ascii chars with wxPython unicode

First i used wxPython without unicode for my text editor but
i need to switch to the unicode version in order to have unicode
support.
But now i need anyway the possibility to save files with just
the ascii charset.
Also i'm a newbie..

Before using wxPython unicode with wxSTC i had not problem
save with the ascii codec word like "andrè", but now i am not able
anymore to save in ascii because the string which wxSTC give
back is in unicode and the codec raise me an error trying to
convert in
ascii...

Is there a solution or the accented cha must be saved
eveytime in utf8?

What are you doing now to convert from utf8 to ascii?