\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows, calc, decorations.pathreplacing}
\usepackage{units}
\usepackage[graphics, active, tightpage]{preview}
\usepackage{pgfplots}
\usepackage{amsmath}
\usepackage[outline]{contour}
\contourlength{1.2pt}
\usepackage{ocr}
\PreviewEnvironment{tikzpicture}

\pgfplotsset{compat=1.16}

\definecolor{presDark}{RGB}{39,1,136}
\definecolor{presDark2}{RGB}{87,80,149}
\definecolor{presLight}{RGB}{139,131,215}
\definecolor{presLight2}{RGB}{0,129,203}

\definecolor{presHighlight}{RGB}{215,50,50}

\begin{document}

\begin{tikzpicture}[
        every path/.style={thick}]
\draw (0,0) circle (.75);
\foreach \i in {0, 45, ..., 360} {
    \draw (\i:.75) -- (\i:.95);
}
\node at (0:.95) [right]  {$\pi/2$};
\node at (90:.95) [above] {0, $2\pi$};
\node at (180:.95) [left] {$\pi$};
\node at (270:.95) [below] {$3\pi/3$};
\node at (0,-1.3) [below] {\verb|bh.axis.Regular(8,0,2*np.pi, circular=True)|};
\end{tikzpicture}

\end{document}
