drop six dependency

anytree/exporter/dotexporter.py

@@ -6,8 +6,6 @@
 from subprocess import check_call
 from tempfile import NamedTemporaryFile
 
-import six
-
 from anytree import PreOrderIter
 
 _RE_ESC = re.compile(r'["\\]')
@@ -315,7 +313,7 @@ def to_picture(self, filename):
     @staticmethod
     def esc(value):
         """Escape Strings."""
-        return _RE_ESC.sub(lambda m: r"\%s" % m.group(0), six.text_type(value))
+        return _RE_ESC.sub(lambda m: r"\%s" % m.group(0), str(value))
 
 
 class UniqueDotExporter(DotExporter):

anytree/exporter/mermaidexporter.py

@@ -2,8 +2,6 @@
 import itertools
 import re
 
-import six
-
 from anytree import PreOrderIter
 
 _RE_ESC = re.compile(r'["\\]')
@@ -242,4 +240,4 @@ def to_file(self, filename):
     @staticmethod
     def esc(value):
         """Escape Strings."""
-        return _RE_ESC.sub(lambda m: r"\%s" % m.group(0), six.text_type(value))
+        return _RE_ESC.sub(lambda m: r"\%s" % m.group(0), str(value))

anytree/iterators/abstractiter.py

@@ -1,7 +1,4 @@
-import six
-
-
-class AbstractIter(six.Iterator):
+class AbstractIter:
     # pylint: disable=R0205
     """
     Iterate over tree starting at `node`.

anytree/render.py

@@ -11,8 +11,6 @@
 
 import collections
 
-import six
-
 from .config import ASSERTIONS
 
 Row = collections.namedtuple("Row", ("pre", "fill", "node"))
@@ -146,7 +144,6 @@ def __init__(self):
         super(DoubleStyle, self).__init__("\u2551   ", "\u2560\u2550\u2550 ", "\u255a\u2550\u2550 ")
 
 
-@six.python_2_unicode_compatible
 class RenderTree:
     """
     Render tree starting at `node`.

pyproject.toml

@@ -33,7 +33,6 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">= 3.7.2, < 4"
-six = '*'
 
 [tool.poetry.group.test.dependencies]
 black = '^22.3.0'

tests/helper.py

@@ -1,8 +1,6 @@
 """Helper Methods for testing."""
 from contextlib import contextmanager
 
-import six
-
 
 def eq_(one, other):
     assert one == other, "{one} != {other}".format(one=one, other=other)

tests/test_dotexport.py

@@ -1,7 +1,9 @@
 from filecmp import cmp
 from os import makedirs
 from os.path import dirname, exists, join
-from shutil import rmtree
+from shutil import rmtree, which
+
+import pytest
 
 from anytree import Node
 from anytree.dotexport import RenderTreeGraph
@@ -71,6 +73,7 @@ def edgeattrfunc(node, child):
     assert cmp(join(GENPATH, "tree2.dot"), join(REFPATH, "tree2.dot"))
 
 
+@pytest.mark.skipif(which("dot") is None, reason="requires graphviz`s `dot` command")
 @with_setup(setup, teardown)
 def test_tree_png():
     """Tree to png."""

tests/test_node_sep.py

@@ -1,8 +1,6 @@
 # -*- coding: utf-8 -*-
 """Test custom node separator."""
 
-import six
-
 import anytree as at
 
 from .helper import assert_raises, eq_