code: def find(self, name=None, **attrs):
          r
          try:
              return next(self.find_all(name, **attrs))
          except StopIteration:
              return None
docs: r"""First descendant node matching criteria.
  
          Returns None if no descendant node found.
  
          :return: descendant node matching criteria
          :rtype: Union[None,TexExpr]
  
          >>> from TexSoup import TexSoup
          >>> soup = TexSoup(r'''
          ... \section{Ooo}
          ... \textit{eee}
          ... \textit{ooo}''')
          >>> soup.find('textit')
          \textit{eee}
          >>> soup.find('textbf')