documentclass[12pt, a4paper, fleqn]{article}
usepackage{multirow}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage[latvian]{babel}
usepackage{geometry}
usepackage{graphicx}
usepackage{amsmath}

usepackage{listings}
usepackage{color}

definecolor{dkgreen}{rgb}{0,0.6,0}
definecolor{gray}{rgb}{0.5,0.5,0.5}
definecolor{mauve}{rgb}{0.58,0,0.82}

lstset{frame=tb,
    language=Python,
    aboveskip=3mm,
    belowskip=3mm,
    showstringspaces=false,
    columns=flexible,
    basicstyle={smallttfamily},
    numbers=none,
    numberstyle=tinycolor{gray},
    keywordstyle=color{blue},
    commentstyle=color{dkgreen},
    stringstyle=color{mauve},
    breaklines=true,
    breakatwhitespace=true,
    tabsize=3
}

geometry{
    paper=a4paper,
    top=2.5cm,
    bottom=3cm,
    left=3cm,
    right=3cm,
    headheight=0.75cm,
    footskip=1.5cm,
    headsep=0.75cm,
}

begin{document}
    begin{lstlisting}
    #Hello, world!
    end{lstlisting}
end{document}