def append(self, *nodes):
self.expr.append(*nodes)<EOL>
r"""Add node(s) to this node's list of children.

        :param TexNode nodes: List of nodes to add

        >>> from TexSoup import TexSoup
        >>> soup = TexSoup(r'''
        ... \begin{itemize}
        ...     \item Hello
        ... \end{itemize}
        ... \section{Hey}
        ... \textit{Willy}''')
        >>> soup.section
        \section{Hey}
        >>> soup.section.append(soup.textit)  # doctest: +ELLIPSIS
        Traceback (most recent call last):
        ...
        TypeError: ...
        >>> soup.section
        \section{Hey}
        >>> soup.itemize.append('    ', soup.item)
        >>> soup.itemize
        \begin{itemize}
            \item Hello
            \item Hello
        \end{itemize}