FROM microsoft/windowsservercore

SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';"]

ENV PYTHON_VERSION %%PLACEHOLDER%%

ENV PYTHON_RELEASE %%PLACEHOLDER%%

# if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"

ENV PYTHON_PIP_VERSION %%PLACEHOLDER%%

ENV PYTHON_SETUPTOOLS_VERSION %%PLACEHOLDER%%

ENV PYTHON_WHEEL_VERSION %%PLACEHOLDER%%

RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env:PYTHON_RELEASE, $env:PYTHON_VERSION); \

Write-Host ('Downloading {0} ...' -f $url); \

(New-Object System.Net.WebClient).DownloadFile($url, 'python.exe'); \

\

Write-Host 'Installing ...'; \

# https://docs.python.org/3.5/using/windows.html#installing-without-ui

Start-Process python.exe -Wait \

-ArgumentList @( \

'/quiet', \

'InstallAllUsers=1', \

'TargetDir=C:\Python', \

'PrependPath=1', \

'Shortcuts=0', \

'Include_doc=0', \

'Include_test=0' \

); \

\

# the installer updated PATH, so we should refresh our local value

$env:PATH = [Environment]::GetEnvironmentVariable('PATH', [EnvironmentVariableTarget]::Machine); \

\

Write-Host 'Verifying install ...'; \

Write-Host ' python --version'; python --version; \

\

Write-Host 'Removing ...'; \

Remove-Item python.exe -Force; \

\

Write-Host ('Installing pip=={0} ...' -f $env:PYTHON_PIP_VERSION); \

# we use "--force-reinstall" for the case where the version of pip we're trying to install is the same as the version bundled with Python

# ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")

# https://github.com/docker-library/python/pull/143#issuecomment-241032683

# (using "python -m pip" instead of "pip" to avoid pip trying to remove itself while it's running; see also https://pip.readthedocs.io/en/stable/installing/#id6)

python -m pip install --no-cache-dir --upgrade --force-reinstall \

('pip=={0}' -f $env:PYTHON_PIP_VERSION) \

('setuptools=={0}' -f $env:PYTHON_SETUPTOOLS_VERSION) \

('wheel=={0}' -f $env:PYTHON_WHEEL_VERSION) \

; \

\

Write-Host 'Verifying pip install ...'; \

pip --version; \

\

Write-Host 'Complete.';

CMD ["python"]