parameters: (self, content=None)
docstring: Initializer.
  
          The argument is either a pattern or None.  If it is None, this
          only matches an empty sequence (effectively '$' in regex
          lingo).  If it is not None, this matches whenever the argument
          pattern doesn't have any matches.
docstring_summary: Initializer.
docstring_tokens: Initializer .
function: def __init__(self, content=None):
          """
          Initializer.
  
          The argument is either a pattern or None.  If it is None, this
          only matches an empty sequence (effectively '$' in regex
          lingo).  If it is not None, this matches whenever the argument
          pattern doesn't have any matches.
          """
          if content is not None:
              assert isinstance(content, BasePattern), repr(content)
          self.content = content
function_tokens: def __init__ ( self , content = None ) : if content is not None : assert isinstance ( content , BasePattern ) , repr ( content ) self . content = content