Remove manual Python installation from Ubuntu 20.04

ci/docker/linux-apt-python-3.dockerfile

@@ -24,20 +24,6 @@ COPY python/requirements-build.txt \
 
 ENV ARROW_PYTHON_VENV /arrow-dev
 
-ARG ubuntu
-ARG python="3.12"
-COPY ci/scripts/install_python.sh /arrow/ci/scripts/
-# Ubuntu 20.04 uses python 3.8 which is unsuported for pyarrow
-RUN if [ "${ubuntu}" = "20.04" ]; then \
- quiet=$([ "${DEBUG}" = "yes" ] || echo "-qq") && \
- apt update ${quiet} && \
- apt install -y -V ${quiet} \
- xz-utils && \
- apt clean && \
- rm -rf /var/lib/apt/lists/* && \
- /arrow/ci/scripts/install_python.sh linux ${python} \
- ; fi
-
 RUN python3 -m venv ${ARROW_PYTHON_VENV} && \
  . ${ARROW_PYTHON_VENV}/bin/activate && \
  pip install -U pip setuptools wheel && \

ci/scripts/install_python.sh

@@ -68,29 +68,6 @@ if [ $platform = "macOS" ]; then
  python="/Library/Frameworks/Python.framework/Versions/${version}/bin/python${version}"
  pip="${python} -m pip"
 
- $python -m ensurepip
- $pip install -U pip setuptools
-elif [ $platform = "Linux" ] ; then
- echo "Downloading Python installer..."
-
- if [ "$version" = "3.13" ];
- then
- fname="Python-${full_version}rc1.tar.xz"
- else
- fname="Python-${full_version}.tar.xz"
- fi
- wget "https://www.python.org/ftp/python/${full_version}/${fname}"
-
- echo "Building and installing Python..."
- tar -xf ${fname}
- rm $fname
- pushd Python-3.*
- ./configure
- make install
- popd
- python=/usr/local/bin/python3
- pip="${python} -m pip"
-
  $python -m ensurepip
  $pip install -U pip setuptools
 else

ci/scripts/r_test.sh

@@ -102,7 +102,7 @@ SCRIPT="as_cran <- !identical(tolower(Sys.getenv('NOT_CRAN')), 'true')
  if (requireNamespace('reticulate', quietly = TRUE) && reticulate::py_module_available('pyarrow')) {
  message('Running flight demo server for tests.')
  pid_flight <- sys::exec_background(
- 'python3',
+ 'python',
  c(
  '-c',
  paste0(

docker-compose.yml

@@ -917,19 +917,17 @@ services:
  # Parameters:
  # ARCH: amd64
  # CUDA: <depends on your nvidia driver, should match system CUDA>
- # UBUNTU: 20.04, 22.04, ...
+ # UBUNTU: 22.04, 24.04
  # PYTHON: 3.9, 3.10, 3.11, ...
- image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cuda-${CUDA}-python-${PYTHON}
+ image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cuda-${CUDA}-python-3
  build:
  context: .
  dockerfile: ci/docker/linux-apt-python-3.dockerfile
  cache_from:
- - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cuda-${CUDA}-python-${PYTHON}
+ - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cuda-${CUDA}-python-3
  args:
  base: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cuda-${CUDA}-cpp
  numba: ${NUMBA}
- ubuntu: ${UBUNTU}
- python: ${PYTHON}
  shm_size: *shm-size
  environment:
  <<: [*common, *ccache, *sccache]
@@ -988,18 +986,16 @@ services:
  # docker-compose run --rm ubuntu-python
  # Parameters:
  # ARCH: amd64, arm64v8, ...
- # UBUNTU: 20.04, 22.04
+ # UBUNTU: 22.04, 24.04
  # PYTHON: 3.9, 3.10, ...
- image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-${PYTHON}
+ image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-3
  build:
  context: .
  dockerfile: ci/docker/linux-apt-python-3.dockerfile
  cache_from:
- - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-${PYTHON}
+ - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-3
  args:
  base: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cpp
- ubuntu: ${UBUNTU}
- python: ${PYTHON}
  shm_size: *shm-size
  environment:
  <<: [*common, *ccache]
@@ -1071,18 +1067,16 @@ services:
  # Parameters:
  # ARCH: amd64, arm64v8, ...
  # PYARROW_VERSION: The test target pyarrow version such as "3.0.0"
- # UBUNTU: 20.04, 22.04
+ # UBUNTU: 22.04, 24.04
  # PYTHON: 3.9, 3.10, 3.11, ...
- image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-${PYTHON}
+ image: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-3
  build:
  context: .
  dockerfile: ci/docker/linux-apt-python-3.dockerfile
  cache_from:
- - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-${PYTHON}
+ - ${REPO}:${ARCH}-ubuntu-${UBUNTU}-python-3
  args:
  base: ${REPO}:${ARCH}-ubuntu-${UBUNTU}-cpp
- ubuntu: ${UBUNTU}
- python: ${PYTHON}
  shm_size: *shm-size
  environment:
  <<: [*common, *ccache]