template per codice python

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{listings}
\usepackage{caption}
\usepackage[usenames,dvipsnames]{xcolor}
%
\definecolor{platinum}{HTML}{E5E4E2}
\definecolor{aliceblue}{HTML}{F0F8FF}

\DeclareCaptionFont{white}{\color{white}}
\DeclareCaptionFormat{listing}{%
  \parbox{\textwidth}{\colorbox{cyan}{\parbox{\textwidth}{#1#2#3}}\vskip-4pt}}
\captionsetup[lstlisting]{format=listing,labelfont=white,textfont=white}
\lstset{frame=lrb,keywordstyle=\color{red},language=Python,numbers=left,
backgroundcolor=\color{aliceblue},xleftmargin=\fboxsep,xrightmargin=-\fboxsep}

\begin{document}

\end{document}