build!: Move to Python 3.7 minimum (#4200)

These are build-breaking changes that impose a variety of new minimum dependencies for the toolchain. The new minimum Python version supported is now 3.7. Get rid of 'from future' lines in python scripts in testsuite. Remove python 2.7 specific ref images from testsuite. Needless to say, this will not be backported to any release branches, which guarantee that they will never raise the minimum supported versions of any dependencies. This is just for future OIIO. Signed-off-by: Larry Gritz <lg@larrygritz.com>
AcademySoftwareFoundation · Apr 5, 2024 · 8799aed · 8799aed
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diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -332,26 +332,22 @@ jobs:
           - desc: debug gcc9/C++17, sse4.2, exr2.4
             nametag: linux-gcc9-cpp17-debug
             runner: ubuntu-20.04
-            container:
-              image: ubuntu-18.04
             cxx_compiler: g++-9
             cxx_std: 17
-            python_ver: 2.7
+            python_ver: 3.8
             simd: sse4.2
             openexr_ver: v2.4.3
             pybind11_ver: v2.6.2
             setenvs: export CMAKE_BUILD_TYPE=Debug
                             PUGIXML_VERSION=v1.9
                             CTEST_TEST_TIMEOUT=1200
-
           - desc: static libs gcc9 C++17 exr2.4
             nametag: linux-static
             runner: ubuntu-20.04
-            container:
-              image: ubuntu-18.04
             cxx_compiler: g++-9
             cxx_std: 17
             openexr_ver: v2.4.3
+            python_ver: 3.8
             pybind11_ver: v2.6.2
             setenvs: export BUILD_SHARED_LIBS=OFF
             depcmds: |

diff --git a/INSTALL.md b/INSTALL.md
@@ -36,7 +36,7 @@ NEW or CHANGED MINIMUM dependencies since the last major release are **bold**.
      * Qt5 >= 5.6 (tested through 5.15) or Qt6 (tested through 6.6)
      * OpenGL
  * If you are building the Python bindings or running the testsuite:
-     * Python >= 2.7 (tested against 2.7, 3.7, 3.8, 3.9, 3.10, 3.11)
+     * **Python >= 3.7** (tested through 3.12)
      * pybind11 >= 2.4.2 (Tested through 2.11. Note that pybind11 v2.10+ does
        not support Python < 3.6.)
      * NumPy

diff --git a/Makefile b/Makefile
@@ -389,7 +389,7 @@ help:
 	@echo "      USE_EXTERNAL_PUGIXML=1   Use the system PugiXML, not the one in OIIO"
 	@echo "      USE_QT=0                 Skip anything that needs Qt"
 	@echo "      USE_PYTHON=0             Don't build the Python binding"
-	@echo "      PYTHON_VERSION=2.6       Specify the Python version"
+	@echo "      PYTHON_VERSION=3.9       Specify the Python version"
 	@echo "      USE_NUKE=0               Don't build Nuke plugins"
 	@echo "      Nuke_ROOT=path           Custom Nuke installation"
 	@echo "      NUKE_VERSION=ver         Custom Nuke version"

diff --git a/src/build-scripts/ci-startup.bash b/src/build-scripts/ci-startup.bash
@@ -27,7 +27,7 @@ export LSAN_OPTIONS=suppressions=$PWD/src/build-scripts/nosanitize.txt
 export ASAN_OPTIONS=print_suppressions=0
 export UBSAN_OPTIONS=suppressions=$PWD/src/build-scripts/ubsan-suppressions.txt
 
-export PYTHON_VERSION=${PYTHON_VERSION:="2.7"}
+export PYTHON_VERSION=${PYTHON_VERSION:="3.7"}
 export PYTHONPATH=$OpenImageIO_ROOT/lib/python${PYTHON_VERSION}/site-packages:$PYTHONPATH
 export BUILD_MISSING_DEPS=${BUILD_MISSING_DEPS:=1}
 export COMPILER=${COMPILER:=gcc}

diff --git a/src/build-scripts/gh-installdeps.bash b/src/build-scripts/gh-installdeps.bash
@@ -101,12 +101,8 @@ else
     if [[ "${PYTHON_VERSION}" == "3.9" ]] ; then
         time sudo apt-get -q install -y python3.9-dev python3-numpy
         pip3 --version
-        pip3 install numpy
-    elif [[ "$PYTHON_VERSION" == "2.7" ]] ; then
-        time sudo apt-get -q install -y python-dev python-numpy
-    else
-        pip3 install numpy
     fi
+    pip3 install numpy
 
     if [[ "$USE_LIBHEIF" != "0" ]] ; then
        sudo add-apt-repository ppa:strukturag/libde265 || true

diff --git a/src/build-scripts/gh-win-installdeps.bash b/src/build-scripts/gh-win-installdeps.bash
@@ -25,9 +25,7 @@ export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$DEP_DIR/lib:$VCPKG_INSTALLATION_ROOT/i
 #ls -l "C:/Program Files (x86)/Microsoft Visual Studio" && true
 
 
-if [[ "$PYTHON_VERSION" == "3.6" ]] ; then
-    export CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH;/c/hostedtoolcache/windows/Python/3.6.8/x64"
-elif [[ "$PYTHON_VERSION" == "3.7" ]] ; then
+if [[ "$PYTHON_VERSION" == "3.7" ]] ; then
     export CMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH;/c/hostedtoolcache/windows/Python/3.7.9/x64"
     export Python_EXECUTABLE="/c/hostedtoolcache/windows/Python/3.7.9/x64/python.exe"
     export PYTHONPATH=$OpenImageIO_ROOT/lib/python${PYTHON_VERSION}/site-packages

diff --git a/src/cmake/pythonutils.cmake b/src/cmake/pythonutils.cmake
@@ -34,6 +34,7 @@ macro (find_python)
     endif ()
     checked_find_package (Python ${PYTHON_VERSION}
                           ${_req}
+                          VERSION_MIN 3.7
                           COMPONENTS Interpreter Development
                           PRINT Python_VERSION Python_EXECUTABLE
                                 Python_LIBRARIES

diff --git a/src/doc/conf.py b/src/doc/conf.py
@@ -16,7 +16,6 @@
 # import sys
 # sys.path.insert(0, os.path.abspath('.'))
 
-from __future__ import absolute_import
 import sys
 import os
 import shlex

diff --git a/src/doc/help2man_preformat.py b/src/doc/help2man_preformat.py
@@ -8,8 +8,6 @@
 # and munge such that txt2man generates a simple man page with not-too-horrible
 # formatting.
 
-from __future__ import print_function
-from __future__ import absolute_import
 import sys
 
 lines = [l.rstrip().replace('\t', ' '*8) for l in sys.stdin.readlines()]

diff --git a/src/python/py_oiio.h b/src/python/py_oiio.h
@@ -38,25 +38,16 @@
 #include <OpenImageIO/texture.h>
 #include <OpenImageIO/typedesc.h>
 
-#if PY_MAJOR_VERSION < 3
-OIIO_CLANG_PRAGMA(GCC diagnostic ignored "-Wunused-value")
-#endif
-
 #include <pybind11/numpy.h>
 #include <pybind11/operators.h>
 #include <pybind11/pybind11.h>
 #include <pybind11/stl.h>
 namespace py = pybind11;
 
 
-#if PY_MAJOR_VERSION == 2
-// Preferred Python string caster for Python2 is py::bytes, so it's a byte
-// string (not unicode).
-#    define PY_STR py::bytes
-#else
 // Python3 is always unicode, so return a true str
-#    define PY_STR py::str
-#endif
+#define PY_STR py::str
+
 
 
 namespace pybind11 {

diff --git a/testsuite/docs-examples-python/src/docs-examples-imagebuf.py b/testsuite/docs-examples-python/src/docs-examples-imagebuf.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-imagebufalgo.py b/testsuite/docs-examples-python/src/docs-examples-imagebufalgo.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-imagecache.py b/testsuite/docs-examples-python/src/docs-examples-imagecache.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-imageinput.py b/testsuite/docs-examples-python/src/docs-examples-imageinput.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-imageioapi.py b/testsuite/docs-examples-python/src/docs-examples-imageioapi.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-imageoutput.py b/testsuite/docs-examples-python/src/docs-examples-imageoutput.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-texturesys.py b/testsuite/docs-examples-python/src/docs-examples-texturesys.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/docs-examples-python/src/docs-examples-writingplugins.py b/testsuite/docs-examples-python/src/docs-examples-writingplugins.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 
 
 ############################################################################

diff --git a/testsuite/misnamed-file/run.py b/testsuite/misnamed-file/run.py
@@ -5,7 +5,6 @@
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
 
-from __future__ import absolute_import
 import shutil
 
 # Make a copy called "misnamed.exr" that's actually a TIFF file

diff --git a/testsuite/missingcolor/src/makepartialexr.py b/testsuite/missingcolor/src/makepartialexr.py
@@ -4,8 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
-from __future__ import print_function
-from __future__ import absolute_import
 import OpenImageIO as oiio
 import numpy as np
 

diff --git a/testsuite/oiiotool-color/run.py b/testsuite/oiiotool-color/run.py
@@ -5,7 +5,6 @@
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
 
-from __future__ import absolute_import
 import os
 
 # print("ociover =", ociover)

diff --git a/testsuite/oiiotool-text/run.py b/testsuite/oiiotool-text/run.py
@@ -5,7 +5,6 @@
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
 
-from __future__ import absolute_import
 import os
 
 

diff --git a/testsuite/oiiotool-xform/run.py b/testsuite/oiiotool-xform/run.py
@@ -5,8 +5,6 @@
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
 #import OpenImageIO as oiio
-from __future__ import division
-from __future__ import absolute_import
 import shutil
 import os
 

diff --git a/testsuite/python-colorconfig/ref/out-noocio-python27.txt b/testsuite/python-colorconfig/ref/out-noocio-python27.txt
diff --git a/testsuite/python-colorconfig/ref/out-ocio11-python27.txt b/testsuite/python-colorconfig/ref/out-ocio11-python27.txt
diff --git a/testsuite/python-colorconfig/ref/out-ocio111-python27.txt b/testsuite/python-colorconfig/ref/out-ocio111-python27.txt
diff --git a/testsuite/python-colorconfig/ref/out-ocio21-python27-alt.txt b/testsuite/python-colorconfig/ref/out-ocio21-python27-alt.txt