\begin{Verbatim}[commandchars=@\[\]]
@PYay[with] @PYaX[open](@PYaB[']@PYaB[/etc/passwd]@PYaB['], @PYaB[']@PYaB[r]@PYaB[']) @PYay[as] handle:
    @PYay[for] line @PYav[in] handle:
        @PYay[print] line,
\end{Verbatim}