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+# Sample script to install Python and pip under Windows
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+# Authors: Olivier Grisel and Kyle Kastner
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+# License: CC0 1.0 Universal: http://creativecommons.org/publicdomain/zero/1.0/
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+
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+$BASE_URL = "https://www.python.org/ftp/python/"
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+$GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"
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+$GET_PIP_PATH = "C:\get-pip.py"
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+
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+
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+function DownloadPython ($python_version, $platform_suffix) {
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+ $webclient = New-Object System.Net.WebClient
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+ $filename = "python-" + $python_version + $platform_suffix + ".msi"
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+ $url = $BASE_URL + $python_version + "/" + $filename
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+
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+ $basedir = $pwd.Path + "\"
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+ $filepath = $basedir + $filename
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+ if (Test-Path $filename) {
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+ Write-Host "Reusing" $filepath
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+ return $filepath
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+ }
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+
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+ # Download and retry up to 5 times in case of network transient errors.
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+ Write-Host "Downloading" $filename "from" $url
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+ $retry_attempts = 3
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+ for($i=0; $i -lt $retry_attempts; $i++){
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+ try {
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+ $webclient.DownloadFile($url, $filepath)
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+ break
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+ }
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+ Catch [Exception]{
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+ Start-Sleep 1
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+ }
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+ }
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+ Write-Host "File saved at" $filepath
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+ return $filepath
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+}
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+
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+
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+function InstallPython ($python_version, $architecture, $python_home) {
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+ Write-Host "Installing Python" $python_version "for" $architecture "bit architecture to" $python_home
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+ if (Test-Path $python_home) {
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+ Write-Host $python_home "already exists, skipping."
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+ return $false
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+ }
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+ if ($architecture -eq "32") {
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+ $platform_suffix = ""
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+ } else {
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+ $platform_suffix = ".amd64"
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+ }
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+ $filepath = DownloadPython $python_version $platform_suffix
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+ Write-Host "Installing" $filepath "to" $python_home
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+ $args = "/qn /i $filepath TARGETDIR=$python_home"
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+ Write-Host "msiexec.exe" $args
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+ Start-Process -FilePath "msiexec.exe" -ArgumentList $args -Wait -Passthru
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+ Write-Host "Python $python_version ($architecture) installation complete"
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+ return $true
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+}
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+
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+
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+function InstallPip ($python_home) {
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+ $pip_path = $python_home + "/Scripts/pip.exe"
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+ $python_path = $python_home + "/python.exe"
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+ if (-not(Test-Path $pip_path)) {
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+ Write-Host "Installing pip..."
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+ $webclient = New-Object System.Net.WebClient
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+ $webclient.DownloadFile($GET_PIP_URL, $GET_PIP_PATH)
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+ Write-Host "Executing:" $python_path $GET_PIP_PATH
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+ Start-Process -FilePath "$python_path" -ArgumentList "$GET_PIP_PATH" -Wait -Passthru
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+ } else {
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+ Write-Host "pip already installed."
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+ }
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+}
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+
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+function InstallPackage ($python_home, $pkg) {
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+ $pip_path = $python_home + "/Scripts/pip.exe"
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+ & $pip_path install $pkg
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+}
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+
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+function main () {
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+ InstallPython $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON
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+ InstallPip $env:PYTHON
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+ InstallPackage $env:PYTHON wheel
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+}
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+
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+main
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