Remove python2.7 support

.github/workflows/python-package.yml

@@ -87,7 +87,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['2.7', '3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         include:
           - { os: ubuntu-latest, shell: bash }
           - { os: macos-latest, shell: bash }
@@ -130,9 +130,6 @@ jobs:
     - name: Install python build dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel "flake8>=3.5" check-manifest
-    - name: install mock for python 2.7 tests only
-      if: matrix.python-version == 2.7
-      run: python -m pip install --upgrade mock
     - name: Run check-manifest and lint check
       run: make ci-prebuild
     - name: Build and Install
@@ -172,22 +169,6 @@ jobs:
       # by CMake. CMake is able to find the right toolchain, thanks to
       # the -A argument that we specify in the setup.py to set the
       # target platform (x86, x64, etc).
-      - name: Set Windows Python 2.7 environment variables
-        if: matrix.python-build == 'cp27*' && runner.os == 'Windows'
-        shell: bash
-        run: |
-          echo "DISTUTILS_USE_SDK=1" >> $GITHUB_ENV
-          echo "MSSdk=1" >> $GITHUB_ENV
-
-      - name: Build wheels (Python 2.7)
-        if: matrix.python-build == 'cp27*'
-        # cibuildwheel 1.12.0 is the last release that supported Python 2.7.
-        uses: pypa/[email protected]
-        with:
-          output-dir: wheelhouse
-        env:
-          CIBW_BUILD: ${{ matrix.python-build }}
-
       - name: Build wheels (Python 3)
         uses: pypa/[email protected]
         if: matrix.python-build != 'cp27*'

README.md

@@ -4,7 +4,7 @@ OpenTimelineIO
 ==============
 
 [![Supported VFX Platform Versions](https://img.shields.io/badge/vfx%20platform-2019--2022-lightgrey.svg)](http://www.vfxplatform.com/)
-![Supported Versions](https://img.shields.io/badge/python-2.7%2C%203.7%2C%203.8%2C%203.9%2C%203.10-blue)
+![Supported Versions](https://img.shields.io/badge/python-3.7%2C%203.8%2C%203.9%2C%203.10-blue)
 [![Build Status](https://github.com/AcademySoftwareFoundation/OpenTimelineIO/actions/workflows/python-package.yml/badge.svg)](https://github.com/AcademySoftwareFoundation/OpenTimelineIO/actions/workflows/python-package.yml)
 [![codecov](https://codecov.io/gh/AcademySoftwareFoundation/OpenTimelineIO/branch/main/graph/badge.svg)](https://codecov.io/gh/AcademySoftwareFoundation/OpenTimelineIO)
 [![docs](https://readthedocs.org/projects/opentimelineio/badge/?version=latest)](https://opentimelineio.readthedocs.io/en/latest/index.html)
@@ -55,7 +55,7 @@ Supported VFX Platforms
 -----------------
 The current release supports:
 - VFX platform 2022, 2021, 2020, 2019
-- Python 2.7 - 3.10
+- Python 3.7 - 3.10
 
 For more information on our vfxplatform support policy: [Contribution Guidelines Documentation Page](https://opentimelineio.readthedocs.io/en/latest/tutorials/contributing.html)
 For more information on the vfxplatform: [VFX Platform Homepage](https://vfxplatform.com)
@@ -155,8 +155,8 @@ You can also install the PySide2 dependency with `python -m pip install .[view]`
 
 You may need to escape the `[` depending on your shell, `\[view\]` .
 
-Currently the code base is written against python 2.7, 3.7, 3.8 and 3.9,
-in keeping with the pep8 style.  We ask that before developers submit pull
+Currently the code base is written against python 3.7, 3.8, 3.9, and 3.10, in
+keeping with the pep8 style.  We ask that before developers submit pull
 request, they:
 
 - run `make test` -- to ensure that none of the unit tests were broken

contrib/opentimelineio_contrib/adapters/aaf_adapter/aaf_writer.py

@@ -62,7 +62,7 @@ class AAFValidationError(AAFAdapterError):
     pass
 
 
-class AAFFileTranscriber(object):
+class AAFFileTranscriber:
     """
     AAFFileTranscriber
 
@@ -137,7 +137,7 @@ def track_transcriber(self, otio_track):
             transcriber = AudioTrackTranscriber(self, otio_track)
         else:
             raise otio.exceptions.NotSupportedError(
-                "Unsupported track kind: {}".format(otio_track.kind))
+                f"Unsupported track kind: {otio_track.kind}")
         return transcriber
 
 
@@ -236,7 +236,7 @@ def _generate_empty_mobid(clip):
                 clip_mob_ids[otio_clip] = mob_id
                 break
         else:
-            raise AAFAdapterError("Cannot find mob ID for clip {}".format(otio_clip))
+            raise AAFAdapterError(f"Cannot find mob ID for clip {otio_clip}")
 
     return clip_mob_ids
 
@@ -260,7 +260,7 @@ def _stackify_nested_groups(timeline):
     return copied
 
 
-class _TrackTranscriber(object):
+class _TrackTranscriber:
     """
     _TrackTranscriber is the base class for the conversion of a given otio track.
 
@@ -305,7 +305,7 @@ def transcribe(self, otio_child):
             return operation_group
         else:
             raise otio.exceptions.NotSupportedError(
-                "Unsupported otio child type: {}".format(type(otio_child)))
+                f"Unsupported otio child type: {type(otio_child)}")
 
     @property
     @abc.abstractmethod
@@ -662,11 +662,11 @@ def aaf_sourceclip(self, otio_clip):
         length = int(otio_clip.duration().value)
         c1 = self.aaf_file.create.ControlPoint()
         c1["ControlPointSource"].value = 2
-        c1["Time"].value = aaf2.rational.AAFRational("0/{}".format(length))
+        c1["Time"].value = aaf2.rational.AAFRational(f"0/{length}")
         c1["Value"].value = 0
         c2 = self.aaf_file.create.ControlPoint()
         c2["ControlPointSource"].value = 2
-        c2["Time"].value = aaf2.rational.AAFRational("{}/{}".format(length - 1, length))
+        c2["Time"].value = aaf2.rational.AAFRational(f"{length - 1}/{length}")
         c2["Value"].value = 0
         varying_value = self.aaf_file.create.VaryingValue()
         varying_value.parameterdef = param_def
@@ -675,7 +675,7 @@ def aaf_sourceclip(self, otio_clip):
         opgroup = self.timeline_mobslot.segment
         opgroup.parameters.append(varying_value)
 
-        return super(AudioTrackTranscriber, self).aaf_sourceclip(otio_clip)
+        return super().aaf_sourceclip(otio_clip)
 
     def _create_timeline_mobslot(self):
         """
@@ -738,7 +738,7 @@ def _transition_parameters(self):
         return [param_def_level], level
 
 
-class __check(object):
+class __check:
     """
     __check is a private helper class that safely gets values given to check
     for existence and equality

contrib/opentimelineio_contrib/adapters/advanced_authoring_format.py

@@ -12,18 +12,8 @@
 import os
 import sys
 
-try:
-    # Python 2
-    text_type = unicode
-except NameError:
-    # Python 3
-    text_type = str
-
-try:
-    # Python 3.3+
-    import collections.abc as collections_abc
-except ImportError:
-    import collections as collections_abc
+# Python 3.3+
+import collections.abc as collections_abc
 import fractions
 import opentimelineio as otio
 
@@ -66,7 +56,7 @@ class AAFAdapterError(otio.exceptions.OTIOError):
 
 
 def _get_parameter(item, parameter_name):
-    values = dict((value.name, value) for value in item.parameters.value)
+    values = {value.name: value for value in item.parameters.value}
     return values.get(parameter_name)
 
 
@@ -101,7 +91,7 @@ def _get_class_name(item):
 def _transcribe_property(prop, owner=None):
     # XXX: The unicode type doesn't exist in Python 3 (all strings are unicode)
     # so we have to use type(u"") which works in both Python 2 and 3.
-    if isinstance(prop, (str, type(u""), numbers.Integral, float, dict)):
+    if isinstance(prop, (str, str, numbers.Integral, float, dict)):
         return prop
     elif isinstance(prop, set):
         return list(prop)
@@ -371,7 +361,7 @@ def _extract_timecode_info(mob):
 def _add_child(parent, child, source):
     if child is None:
         if debug:
-            print("Adding null child? {}".format(source))
+            print(f"Adding null child? {source}")
     elif isinstance(child, otio.schema.Marker):
         parent.markers.append(child)
     else:
@@ -409,7 +399,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
     # complex than OTIO.
 
     if isinstance(item, aaf2.content.ContentStorage):
-        msg = "Creating SerializableCollection for {}".format(_encoded_name(item))
+        msg = f"Creating SerializableCollection for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         result = otio.schema.SerializableCollection()
 
@@ -419,7 +409,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
             _add_child(result, child, mob)
 
     elif isinstance(item, aaf2.mobs.Mob):
-        _transcribe_log("Creating Timeline for {}".format(_encoded_name(item)), indent)
+        _transcribe_log(f"Creating Timeline for {_encoded_name(item)}", indent)
         result = otio.schema.Timeline()
 
         for slot in item.slots:
@@ -442,7 +432,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
                 _encoded_name(item), clipUsage
             )
         else:
-            itemMsg = "Creating SourceClip for {}".format(_encoded_name(item))
+            itemMsg = f"Creating SourceClip for {_encoded_name(item)}"
 
         _transcribe_log(itemMsg, indent)
         result = otio.schema.Clip()
@@ -599,7 +589,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         result.out_offset = otio.opentime.RationalTime(out_offset, edit_rate)
 
     elif isinstance(item, aaf2.components.Filler):
-        _transcribe_log("Creating Gap for {}".format(_encoded_name(item)), indent)
+        _transcribe_log(f"Creating Gap for {_encoded_name(item)}", indent)
         result = otio.schema.Gap()
 
         length = item.length
@@ -609,7 +599,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         )
 
     elif isinstance(item, aaf2.components.NestedScope):
-        msg = "Creating Stack for NestedScope for {}".format(_encoded_name(item))
+        msg = f"Creating Stack for NestedScope for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         # TODO: Is this the right class?
         result = otio.schema.Stack()
@@ -619,7 +609,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
             _add_child(result, child, slot)
 
     elif isinstance(item, aaf2.components.Sequence):
-        msg = "Creating Track for Sequence for {}".format(_encoded_name(item))
+        msg = f"Creating Track for Sequence for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         result = otio.schema.Track()
 
@@ -639,13 +629,13 @@ def _transcribe(item, parents, edit_rate, indent=0):
             _add_child(result, child, component)
 
     elif isinstance(item, aaf2.components.OperationGroup):
-        msg = "Creating operationGroup for {}".format(_encoded_name(item))
+        msg = f"Creating operationGroup for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         result = _transcribe_operation_group(item, parents, metadata,
                                              edit_rate, indent + 2)
 
     elif isinstance(item, aaf2.mobslots.TimelineMobSlot):
-        msg = "Creating Track for TimelineMobSlot for {}".format(_encoded_name(item))
+        msg = f"Creating Track for TimelineMobSlot for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         result = otio.schema.Track()
 
@@ -654,7 +644,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         _add_child(result, child, item.segment)
 
     elif isinstance(item, aaf2.mobslots.MobSlot):
-        msg = "Creating Track for MobSlot for {}".format(_encoded_name(item))
+        msg = f"Creating Track for MobSlot for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         result = otio.schema.Track()
 
@@ -671,7 +661,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         pass
 
     elif isinstance(item, aaf2.components.ScopeReference):
-        msg = "Creating Gap for ScopedReference for {}".format(_encoded_name(item))
+        msg = f"Creating Gap for ScopedReference for {_encoded_name(item)}"
         _transcribe_log(msg, indent)
         # TODO: is this like FILLER?
 
@@ -687,7 +677,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         event_mobs = [p for p in parents if isinstance(p, aaf2.mobslots.EventMobSlot)]
         if event_mobs:
             _transcribe_log(
-                "Create marker for '{}'".format(_encoded_name(item)), indent
+                f"Create marker for '{_encoded_name(item)}'", indent
             )
 
             result = otio.schema.Marker()
@@ -731,7 +721,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
             )
 
     elif isinstance(item, aaf2.components.Selector):
-        msg = "Transcribe selector for  {}".format(_encoded_name(item))
+        msg = f"Transcribe selector for  {_encoded_name(item)}"
         _transcribe_log(msg, indent)
 
         selected = item.getvalue('Selected')
@@ -766,7 +756,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
             # Perform a check here to make sure no potential Gap objects
             # are slipping through the cracks
             if isinstance(result, otio.schema.Gap):
-                err = "AAF Selector parsing error: {}".format(type(item))
+                err = f"AAF Selector parsing error: {type(item)}"
                 raise AAFAdapterError(err)
 
             # A Selector can have a set of alternates to handle multiple options for an
@@ -836,7 +826,7 @@ def _transcribe(item, parents, edit_rate, indent=0):
         # For everything else, we just ignore it.
         # To see what is being ignored, turn on the debug flag
         if debug:
-            print("SKIPPING: {}: {} -- {}".format(type(item), item, result))
+            print(f"SKIPPING: {type(item)}: {item} -- {result}")
 
     # Did we get anything? If not, we're done
     if result is None:
@@ -911,7 +901,7 @@ def _find_timecode_track_start(track):
         start = aaf_metadata["Segment"]["Start"]
     except KeyError as e:
         raise AAFAdapterError(
-            "Timecode missing '{}'".format(e)
+            f"Timecode missing '{e}'"
         )
 
     if edit_rate.denominator == 1:

contrib/opentimelineio_contrib/adapters/ale.py

@@ -60,7 +60,7 @@ def _parse_data_line(line, columns, fps, ale_name_column_key='Name'):
             try:
                 start = otio.opentime.from_timecode(value, fps)
             except (ValueError, TypeError):
-                raise ALEParseError("Invalid Start timecode: {}".format(value))
+                raise ALEParseError(f"Invalid Start timecode: {value}")
             duration = None
             end = None
             if metadata.get("Duration", "") != "":
@@ -137,7 +137,7 @@ def _parse_data_line(line, columns, fps, ale_name_column_key='Name'):
 
 def _cdl_values_from_metadata(asc_sop_string):
 
-    if not isinstance(asc_sop_string, (type(''), type(u''))):
+    if not isinstance(asc_sop_string, (str, str)):
         return {}
 
     asc_sop_values = ASC_SOP_REGEX.findall(asc_sop_string)
@@ -285,7 +285,7 @@ def write_to_string(input_otio, columns=None, fps=None, video_format=None):
     headers = list(header.items())
     headers.sort()  # make the output predictable
     for key, val in headers:
-        result += "{}\t{}\n".format(key, val)
+        result += f"{key}\t{val}\n"
 
     # If the caller passed in a list of columns, use that, otherwise
     # we need to discover the columns that should be output.

contrib/opentimelineio_contrib/adapters/extern_rv.py

@@ -29,7 +29,7 @@
 
 
 # because json.loads returns a unicode type
-_UNICODE_TYPE = type(u"")
+_UNICODE_TYPE = str
 
 
 def main():