使用 titlesec 删除括号后的 ')'

Question

我的代码：

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{titlesec}
\begin{document}

% Set Section Title Formatting %

\titleformat{\section}{\bfseries}{\thesection}{1em}{}[{\titlerule[0.8pt]}]

\titleformat{\subsection}{\bfseries}{\thesubsection}{1em}{}[]

\titleformat{\subsubsection}{\bfseries\itshape}{\thesubsubsection}{1em}{}[]

\titleformat{\paragraph}{\itshape}{\theparagraph)}{1em}{}[]

\setcounter{secnumdepth}{4}

\section{Introduction}
\subsection{Subsection}
\subsubsection{Subsubsection}
\paragraph{Paragraph}

\end{document}

输出：

期望输出：

Answer 1

如果仔细查看代码，会发现后面有一个括号\theparagraph。如果将其删除，则会得到所需的输出。

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{titlesec}
\begin{document}

% Set Section Title Formatting %

\titleformat{\section}{\bfseries}{\thesection}{1em}{}[{\titlerule[0.8pt]}]

\titleformat{\subsection}{\bfseries}{\thesubsection}{1em}{}[]

\titleformat{\subsubsection}{\bfseries\itshape}{\thesubsubsection}{1em}{}[]

\titleformat{\paragraph}{\itshape}{\theparagraph}{1em}{}[]

\setcounter{secnumdepth}{4}

\section{Introduction}
\subsection{Subsection}
\subsubsection{Subsubsection}
\paragraph{Paragraph}

\end{document}