content: 
  __all__ = ['BaseDumper', 'SafeDumper', 'Dumper']
  
  from emitter import *
  from serializer import *
  from representer import *
  from resolver import *
  
  class BaseDumper(Emitter, Serializer, BaseRepresenter, BaseResolver):
  
      def __init__(self, stream,
              default_style=None, default_flow_style=None,
              canonical=None, indent=None, width=None,
              allow_unicode=None, line_break=None,
              encoding=None, explicit_start=None, explicit_end=None,
              version=None, tags=None):
          Emitter.__init__(self, stream, canonical=canonical,
                  indent=indent, width=width,
                  allow_unicode=allow_unicode, line_break=line_break)
          Serializer.__init__(self, encoding=encoding,
                  explicit_start=explicit_start, explicit_end=explicit_end,
                  version=version, tags=tags)
          Representer.__init__(self, default_style=default_style,
                  default_flow_style=default_flow_style)
          Resolver.__init__(self)
  
  class SafeDumper(Emitter, Serializer, SafeRepresenter, Resolver):
  
      def __init__(self, stream,
              default_style=None, default_flow_style=None,
              canonical=None, indent=None, width=None,
              allow_unicode=None, line_break=None,
              encoding=None, explicit_start=None, explicit_end=None,
              version=None, tags=None):
          Emitter.__init__(self, stream, canonical=canonical,
                  indent=indent, width=width,
                  allow_unicode=allow_unicode, line_break=line_break)
          Serializer.__init__(self, encoding=encoding,
                  explicit_start=explicit_start, explicit_end=explicit_end,
                  version=version, tags=tags)
          SafeRepresenter.__init__(self, default_style=default_style,
                  default_flow_style=default_flow_style)
          Resolver.__init__(self)
  
  class Dumper(Emitter, Serializer, Representer, Resolver):
  
      def __init__(self, stream,
              default_style=None, default_flow_style=None,
              canonical=None, indent=None, width=None,
              allow_unicode=None, line_break=None,
              encoding=None, explicit_start=None, explicit_end=None,
              version=None, tags=None):
          Emitter.__init__(self, stream, canonical=canonical,
                  indent=indent, width=width,
                  allow_unicode=allow_unicode, line_break=line_break)
          Serializer.__init__(self, encoding=encoding,
                  explicit_start=explicit_start, explicit_end=explicit_end,
                  version=version, tags=tags)
          Representer.__init__(self, default_style=default_style,
                  default_flow_style=default_flow_style)
          Resolver.__init__(self)
  
  