Add python 2 to Ubuntu build matrix.

Author: stefanseefeld

.github/get-py-env.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 #
 # Determine info about the Python install and write shell code to stdout, to
 # set env variables.  This will set the variables PY_LDFLAGS, PY_CFLAGS and
@@ -41,7 +41,7 @@ def find_python_h():
     python3-config but not the sysconfig info (after moving the
     install).
     """
-    c_flags = extract_flags(['python3-config', '--cflags'], '-I')
+    c_flags = extract_flags(['python-config', '--cflags'], '-I')
     for part in c_flags.split():
         m = re.search(r'-I(\S+)', part)
         if not m:
@@ -53,12 +53,12 @@ def find_python_h():
 
 
 def main():
-    ld_flags = extract_flags(['python3-config', '--ldflags'], '-L')
-    c_flags = extract_flags(['python3-config', '--cflags'], '-I')
+    ld_flags = extract_flags(['python-config', '--ldflags'], '-L')
+    c_flags = extract_flags(['python-config', '--cflags'], '-I')
     include_path = find_python_h()
-    print(f'PY_LDFLAGS="{ld_flags}"')
-    print(f'PY_CFLAGS="{c_flags}"')
-    print(f'PY_INC_PATH="{include_path}"')
+    print('PY_LDFLAGS="{}"'.format(ld_flags))
+    print('PY_CFLAGS="{}"'.format(c_flags))
+    print('PY_INC_PATH="{}"'.format(include_path))
 
 
 if __name__ == '__main__':

.github/run-faber.sh

@@ -4,23 +4,23 @@ set -eu
 
 echo "cxx version: $CXX $($CXX --version)"
 echo "cxx std: $CXX_STD"
-echo "python3 path: $(which python3)"
-echo "python3 version: $(python3 --version)"
+echo "python path: $(which python)"
+echo "python version: $(python --version)"
 
 if ! which faber > /dev/null; then
     echo "Installing faber..."
-    python3 -m pip install --upgrade pip
-    python3 -m pip install -U faber
+    python -m pip install --upgrade pip
+    python -m pip install -U faber
 fi
 echo "faber version: $(faber -v)"
 
 # find and set PY_LDFLAGS and PY_INC_PATH
-eval $(python3 .github/get-py-env.py)
+eval $(python .github/get-py-env.py)
 
 echo "PY_INC_PATH=$PY_INC_PATH"
 echo "PY_LDFLAGS=$PY_LDFLAGS"
 
-case $(python3-config --abiflags) in
+case $(python-config --abiflags) in
     *t*)
         # When running with free-threaded, we always want to disable the GIL
         # even for extensions without the mod_gil_not_used() flag
@@ -29,10 +29,10 @@ case $(python3-config --abiflags) in
 esac
 
 # this could be set by LD_LIBRARY_PATH but faber overrides it
-prefix=$(python3-config --prefix)
+prefix=$(python-config --prefix)
 echo "${prefix}/lib" > /etc/ld.so.conf.d/boost-ci.conf && ldconfig
 
-sed -e "s/\$PYTHON/python3/g" .ci/faber > $HOME/.faber
+sed -e "s/\$PYTHON/python/g" .ci/faber > $HOME/.faber
 
 faber \
   --with-boost-include=${BOOST_PY_DEPS} \

.github/workflows/test-ubuntu.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.14']
+        python-version: ['2.7', '3.14']
         cxx: [g++, clang++]
         std: [c++11, c++14, c++17]
         include:
@@ -34,6 +34,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: setup python
+      if: "${{ matrix.python-version  != '2.7' }}"
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}