diff --git a/graphviz/_tools.py b/graphviz/_tools.py
index 97c7dbf0a6..59c50bbc40 100644
--- a/graphviz/_tools.py
+++ b/graphviz/_tools.py
@@ -129,7 +129,7 @@ def deprecate_positional_args(*,
         https://docs.python.org/3/library/exceptions.html#DeprecationWarning
         https://docs.python.org/3/library/exceptions.html#PendingDeprecationWarning
     """
-    assert supported_number > 0, f'supported_number at least one: {supported_number!r}'
+    assert supported_number >= 0, f'supported_number => 0: {supported_number!r}'
 
     if category is None:
         def nulldecorator(func):
diff --git a/graphviz/dot.py b/graphviz/dot.py
index 70f90c0043..8b7bad0ddb 100644
--- a/graphviz/dot.py
+++ b/graphviz/dot.py
@@ -143,7 +143,7 @@ def _copy_kwargs(self, **kwargs):
                                     body=list(self.body),
                                     strict=self.strict)
 
-    @_tools.deprecate_positional_args(supported_number=1)
+    @_tools.deprecate_positional_args(supported_number=0, ignore_arg='self')
     def clear(self, keep_attrs: bool = False) -> None:
         """Reset content to an empty body, clear graph/node/egde_attr mappings.
 
@@ -155,7 +155,7 @@ def clear(self, keep_attrs: bool = False) -> None:
                 a.clear()
         self.body.clear()
 
-    @_tools.deprecate_positional_args(supported_number=1)
+    @_tools.deprecate_positional_args(supported_number=0, ignore_arg='self')
     def __iter__(self, subgraph: bool = False) -> typing.Iterator[str]:
         r"""Yield the DOT source code line by line (as graph or subgraph).
 
@@ -181,7 +181,7 @@ def __iter__(self, subgraph: bool = False) -> typing.Iterator[str]:
 
         yield self._tail
 
-    @_tools.deprecate_positional_args(supported_number=3)
+    @_tools.deprecate_positional_args(supported_number=2, ignore_arg='self')
     def node(self, name: str,
              label: typing.Optional[str] = None,
              _attributes=None, **attrs) -> None:
@@ -203,7 +203,7 @@ def node(self, name: str,
         line = self._node(name, attr_list)
         self.body.append(line)
 
-    @_tools.deprecate_positional_args(supported_number=4)
+    @_tools.deprecate_positional_args(supported_number=3, ignore_arg='self')
     def edge(self, tail_name: str, head_name: str,
              label: typing.Optional[str] = None,
              _attributes=None, **attrs) -> None:
@@ -254,7 +254,7 @@ def edges(self, tail_head_iter) -> None:
         self.body += [edge(tail=quote(t), head=quote(h))
                       for t, h in tail_head_iter]
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def attr(self, kw: typing.Optional[str] = None,
              _attributes=None, **attrs) -> None:
         """Add a general or graph/node/edge attribute statement.
@@ -278,7 +278,7 @@ def attr(self, kw: typing.Optional[str] = None,
                 line = self._attr(kw, attr_list)
             self.body.append(line)
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def subgraph(self, graph=None,
                  name: typing.Optional[str] = None,
                  comment: typing.Optional[str] = None,
diff --git a/graphviz/graphs.py b/graphviz/graphs.py
index 9018e57c51..ffca995d06 100644
--- a/graphviz/graphs.py
+++ b/graphviz/graphs.py
@@ -49,7 +49,7 @@ class BaseGraph(dot.Dot,
                 unflattening.Unflatten):
     """Dot language creation and source code rendering."""
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def __init__(self, name: typing.Optional[str] = None,
                  comment: typing.Optional[str] = None,
                  filename=None, directory=None,
diff --git a/graphviz/piping.py b/graphviz/piping.py
index 71767c23d2..c92835b9db 100644
--- a/graphviz/piping.py
+++ b/graphviz/piping.py
@@ -109,7 +109,7 @@ def pipe(self,
                                  engine=engine,
                                  encoding=encoding)
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def _pipe_legacy(self,
                      format: typing.Optional[str] = None,
                      renderer: typing.Optional[str] = None,
diff --git a/graphviz/rendering.py b/graphviz/rendering.py
index 191ce330bb..d63f086264 100644
--- a/graphviz/rendering.py
+++ b/graphviz/rendering.py
@@ -18,7 +18,7 @@
 class Render(saving.Save, backend.Render, backend.View):
     """Write source lines to file and render with Graphviz."""
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def render(self,
                filename: typing.Union[os.PathLike, str, None] = None,
                directory: typing.Union[os.PathLike, str, None] = None,
@@ -147,7 +147,7 @@ def _view(self, filepath: typing.Union[os.PathLike, str], *,
                                f' on {backend.viewing.PLATFORM!r} platform')
         view_method(filepath, quiet=quiet)
 
-    @_tools.deprecate_positional_args(supported_number=2)
+    @_tools.deprecate_positional_args(supported_number=1, ignore_arg='self')
     def view(self,
              filename: typing.Union[os.PathLike, str, None] = None,
              directory: typing.Union[os.PathLike, str, None] = None,
diff --git a/graphviz/unflattening.py b/graphviz/unflattening.py
index c87cc7db8b..06565bfde8 100644
--- a/graphviz/unflattening.py
+++ b/graphviz/unflattening.py
@@ -14,7 +14,7 @@
 class Unflatten(encoding.Encoding, base.Base, backend.Unflatten):
     """Pipe source through the Graphviz *unflatten* preprocessor."""
 
-    @_tools.deprecate_positional_args(supported_number=1)
+    @_tools.deprecate_positional_args(supported_number=0, ignore_arg='self')
     def unflatten(self,
                   stagger: typing.Optional[int] = None,
                   fanout: bool = False,