\begin{Verbatim}[commandchars=@\[\]]
handler @PYbe[=] @PYaX[open](@PYaB[']@PYaB[/etc/passwd]@PYaB['], @PYaB[']@PYaB[r]@PYaB['])
@PYay[try]:
    @PYay[for] line @PYav[in] handler:
        @PYay[print] line,
@PYay[finally]:
    handler@PYbe[.]close()
\end{Verbatim}