ACHCTLUALLY… buster is py3 by default.

memmos.laas.fr:5000/gepetto/buildfarm/robotpkg-base/buster/Dockerfile

@@ -14,7 +14,7 @@ RUN --mount=type=cache,sharing=locked,target=/var/cache/apt --mount=type=cache,s
     git \
     make \
     pax \
-    python \
+    python3 \
     tar \
     && git config --global user.email = "guilhem.saurel@laas.fr" \
     && git config --global user.name = "Buildfarm" \
@@ -30,8 +30,8 @@ ENV ROBOTPKG_BASE=/opt/openrobots \
     GIT_SUBMODULE_STRATEGY=recursive \
     CTEST_OUTPUT_ON_FAILURE=1 \
     CTEST_PARALLEL_LEVEL=4 \
-    PYTHON=python2 \
-    PY=2.7
+    PYTHON=python3 \
+    PY=3.7
 
 ENV CMAKE_PREFIX_PATH=$ROBOTPKG_BASE:$CMAKE_PREFIX_PATH \
       LD_LIBRARY_PATH=$ROBOTPKG_BASE/lib:$ROBOTPKG_BASE/lib/plugin:$ROBOTPKG_BASE/lib/dynamic-graph-plugins:$LD_LIBRARY_PATH \

memmos.laas.fr:5000/gepetto/buildfarm/ros/buster/Dockerfile

@@ -16,7 +16,6 @@ ENV ROS_ETC_DIR=${ROS_PREFIX}/etc/ros \
     ROS_ROOT=${ROS_PREFIX}/share/ros \
     ROS_VERSION=1 \
     PATH=${ROS_PREFIX}/bin:${PATH} \
-    PYTHONPATH=${ROS_PREFIX}/lib/python${PY}/dist-packages \
     CMAKE_PREFIX_PATH=${ROS_PREFIX} \
     LD_LIBRARY_PATH=${ROS_PREFIX}/lib:${ROS_PREFIX}/lib/x86_64-linux-gnu \
     PKG_CONFIG_PATH=${ROS_PREFIX}/lib/pkgconfig:${ROS_PREFIX}/lib/x86_64-linux-gnu/pkgconfig

sysdeps/buster

@@ -38,21 +38,20 @@ llvm
 m4
 pkg-config
 psmisc
-python2.7-dev
+python3-dev
+python3-crypto
+python3-defusedxml
+python3-empy
+python3-gnupg
 python3-matplotlib
-python-crypto
-python-defusedxml
-python-empy
-python-gnupg
-python-matplotlib
-python-netifaces
-python-nose
-python-numpy
-python-paramiko
-python-pil
-python-pyparsing
-python-setuptools
-python-yaml
+python3-netifaces
+python3-nose
+python3-numpy
+python3-paramiko
+python3-pil
+python3-pyparsing
+python3-setuptools
+python3-yaml
 qt5-qmake
 qtbase5-dev
 qtbase5-private-dev