parameters: (nodes, stream=None, Dumper=Dumper,
          canonical=None, indent=None, width=None,
          allow_unicode=None, line_break=None,
          encoding='utf-8', explicit_start=None, explicit_end=None,
          version=None, tags=None)
docstring: Serialize a sequence of representation trees into a YAML stream.
      If stream is None, return the produced string instead.
docstring_summary: Serialize a sequence of representation trees into a YAML stream.
      If stream is None, return the produced string instead.
docstring_tokens: Serialize a sequence of representation trees into a YAML stream . If stream is None return the produced string instead .
function: def serialize_all(nodes, stream=None, Dumper=Dumper,
          canonical=None, indent=None, width=None,
          allow_unicode=None, line_break=None,
          encoding='utf-8', explicit_start=None, explicit_end=None,
          version=None, tags=None):
      """
      Serialize a sequence of representation trees into a YAML stream.
      If stream is None, return the produced string instead.
      """
      getvalue = None
      if stream is None:
          try:
              from cStringIO import StringIO
          except ImportError:
              from StringIO import StringIO
          stream = StringIO()
          getvalue = stream.getvalue
      dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
              allow_unicode=allow_unicode, line_break=line_break,
              encoding=encoding, version=version, tags=tags,
              explicit_start=explicit_start, explicit_end=explicit_end)
      dumper.open()
      for node in nodes:
          dumper.serialize(node)
      dumper.close()
      if getvalue:
          return getvalue()
function_tokens: def serialize_all ( nodes , stream = None , Dumper = Dumper , canonical = None , indent = None , width = None , allow_unicode = None , line_break = None , encoding = 'utf-8' , explicit_start = None , explicit_end = None , version = None , tags = None ) : getvalue = None if stream is None : try : from cStringIO import StringIO except ImportError : from StringIO import StringIO stream = StringIO ( ) getvalue = stream . getvalue dumper = Dumper ( stream , canonical = canonical , indent = indent , width = width , allow_unicode = allow_unicode , line_break = line_break , encoding = encoding , version = version , tags = tags , explicit_start = explicit_start , explicit_end = explicit_end ) dumper . open ( ) for node in nodes : dumper . serialize ( node ) dumper . close ( ) if getvalue : return getvalue ( )