Drop py2 support

Author: vidartf

Diff for: js/scripts/templates/py_wrapper.mustache

@@ -1,4 +1,3 @@
-import six
 from ipywidgets import (
     Widget, DOMWidget, widget_serialization, register
 )
@@ -57,7 +56,6 @@ class {{ className }}({{ superClass.className }}):
 
     {{/each}}
 
-if six.PY3:
-    import inspect
-    # Include explicit signature since the metaclass screws it up
-    {{ className }}.__signature__ = inspect.signature({{ className }}.__init__)
+import inspect
+# Include explicit signature since the metaclass screws it up
+{{ className }}.__signature__ = inspect.signature({{ className }}.__init__)

Diff for: pythreejs/_base/uniforms.py

@@ -1,6 +1,4 @@
 
-from six import string_types
-
 from ipywidgets import Widget, widget_serialization
 
 def serialize_uniforms(uniforms, obj):
@@ -19,7 +17,7 @@ def serialize_uniforms(uniforms, obj):
                 'value': widget_serialization['to_json'](value, None)
             }
 
-        elif isinstance(value, string_types):
+        elif isinstance(value, str):
             serialized[name] = {
                 'type': 'c',
                 'value': value

Diff for: pythreejs/core/Renderer.py

@@ -1,7 +1,6 @@
 """
 """
 
-import six
 from contextlib import contextmanager
 from ipywidgets import widget_serialization
 from traitlets import (
@@ -69,17 +68,16 @@ def hold(self):
             self._pause_autorender = False
 
 
-if six.PY3:
-    from inspect import Signature, Parameter
-    # Include explicit signature since the metaclass screws it up
-    parameters = [
-        Parameter('scene', Parameter.POSITIONAL_OR_KEYWORD),
-        Parameter('camera', Parameter.POSITIONAL_OR_KEYWORD),
-        Parameter('controls', Parameter.POSITIONAL_OR_KEYWORD, default=None),
-    ]
-    for name in ('width', 'height', 'background', 'background_opacity'):
-        parameters.append(Parameter(
-            name, Parameter.KEYWORD_ONLY, default=getattr(Renderer, name).default_value))
-    parameters.append(Parameter('kwargs', Parameter.VAR_KEYWORD))
-    Renderer.__signature__ = Signature(parameters=tuple(parameters))
-    del parameters
+from inspect import Signature, Parameter
+# Include explicit signature since the metaclass screws it up
+parameters = [
+    Parameter('scene', Parameter.POSITIONAL_OR_KEYWORD),
+    Parameter('camera', Parameter.POSITIONAL_OR_KEYWORD),
+    Parameter('controls', Parameter.POSITIONAL_OR_KEYWORD, default=None),
+]
+for name in ('width', 'height', 'background', 'background_opacity'):
+    parameters.append(Parameter(
+        name, Parameter.KEYWORD_ONLY, default=getattr(Renderer, name).default_value))
+parameters.append(Parameter('kwargs', Parameter.VAR_KEYWORD))
+Renderer.__signature__ = Signature(parameters=tuple(parameters))
+del parameters

Diff for: pythreejs/traits.py

@@ -2,11 +2,7 @@
 # -*- coding: utf-8 -*-
 
 from collections import namedtuple
-try:
-    from collections.abc import Sequence  # python3
-except ImportError:
-    from collections import Sequence  # python2
-import six
+from collections.abc import Sequence
 import re
 import warnings
 
@@ -254,7 +250,7 @@ class Color(Unicode):
     def validate(self, obj, value):
         if value is None and self.allow_none:
             return value
-        if isinstance(value, six.string_types):
+        if isinstance(value, str):
             if value.lower() in _color_names or _color_re.match(value):
                 return value
             elif _color_hexa_re.match(value) or _color_rgbhsl_re.match(value):

Diff for: setup.cfg

@@ -1,5 +1,5 @@
 [bdist_wheel]
-universal=1
+universal=0
 
 [metadata]
 license_file = LICENSE

Diff for: setup.py

@@ -62,6 +62,7 @@
     'long_description_content_type': 'text/markdown',
     'license': 'BSD-3-Clause',
     'include_package_data': True,
+    'python_requires': '>=3.7',
     'install_requires': [
         'ipywidgets>=7.2.1',
         'ipydatawidgets>=1.1.1',