Python Script creates strange String Symbols

Hi there
i simply try to make a script to set the rendering file path.
why does it create a symbol instead of /v?

py_badsymbol

i guess it read „\v‟ as ASCII Vertical Tab (VT) because of Escape Sequence. I don’t know why it read path with them.
use forward slash, “/” or double backslashes “\”

Cool!
double backslashes works!
thx!