Automatically include a sequence of images

Here is an option using multido:

\documentclass{beamer}
\usepackage{multido}
\begin{document}
\multido{\i=1+1}{9}{%
  \begin{frame}
    \frametitle{Title: \i}
    \framesubtitle{Subtitle: \i}
    \centering
    \includegraphics[width=.9\linewidth]{example-image-\i}
  \end{frame}
}
\end{document}

The syntax is \multido{<var>=<start>+<inc>}{<times}{<stuff>} which defines <var> to be <start>, incremented by <inc> a total of <times>-1 times (since the first value counts as an iteration), and with each iteration it executes <stuff>. The special \i-notation means that <var> will be an integer.

The above example assumes minimal changes from one element to the next. If, for example, you have varied content for the frame title, subtitle and any additional comments on a per-photo basis, then using a list-like approach would be far better. For than, any of the techniques mentioned in How to iterate over a comma separated list? would be helpful.

I have a tex file that I wrote to produce a display of photos that does something like this. For me the goal is to arrange a changing collection of photos on a grid covering the page. I use tikz to both loop over the photos, that are stored as a comma separated list of image filenames, and to place the photos.

As you are talking about generating the list of filenames via python you could easily populate a variable list like the one used below.

Here is a cut down version:

\documentclass{article}
\usepackage{mwe}
\usepackage{graphicx}
\usepackage{tikz}

\def\MyImages{example-image-a,example-image-b,example-image-c}% list of images
\begin{document}
  \newdimen\X
  \begin{tikzpicture}[overlay,
          picture/.style={draw,rectangle,anchor=#1,inner sep=0pt,outer sep=0pt}
     ]
     \X=0mm
     \foreach \Image in \MyImages {
       \node[picture=north west] at (\X,-101.5mm)
             {\includegraphics[width=49.5mm,height=35mm]{\Image}};
       \global\advance\X by 49.5mm
     }
  \end{tikzpicture}
\end{document}

This produces: