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# Sample script to install Python and pip under Windows
# Authors: Olivier Grisel, Jonathan Helmus, Kyle Kastner, and Alex Willmer
# License: CC0 1.0 Universal: http://creativecommons.org/publicdomain/zero/1.0/
# Source: https://github.com/ogrisel/python-appveyor-demo/blob/master/appveyor/install.ps1
$BASE_URL = "https://www.python.org/ftp/python/"
$GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"
$GET_PIP_PATH = "C:\get-pip.py"
$PYTHON_PRERELEASE_REGEX = @"
(?x)
(?<major>\d+)
\.
(?<minor>\d+)
\.
(?<micro>\d+)
(?<prerelease>[a-z]{1,2}\d+)
"@
function Download ($filename, $url) {
$webclient = New-Object System.Net.WebClient
$basedir = $pwd.Path + "\"
$filepath = $basedir + $filename
if (Test-Path $filename) {
Write-Host "Reusing" $filepath
return $filepath
}
# Download and retry up to 3 times in case of network transient errors.
Write-Host "Downloading" $filename "from" $url
$retry_attempts = 2
for ($i = 0; $i -lt $retry_attempts; $i++) {
try {
$webclient.DownloadFile($url, $filepath)
break
}
Catch [Exception]{
Start-Sleep 1
}
}
if (Test-Path $filepath) {
Write-Host "File saved at" $filepath
} else {
# Retry once to get the error message if any at the last try
$webclient.DownloadFile($url, $filepath)
}
return $filepath
}
function ParsePythonVersion ($python_version) {
if ($python_version -match $PYTHON_PRERELEASE_REGEX) {
return ([int]$matches.major, [int]$matches.minor, [int]$matches.micro,
$matches.prerelease)
}
$version_obj = [version]$python_version
return ($version_obj.major, $version_obj.minor, $version_obj.build, "")
}
function DownloadPython ($python_version, $platform_suffix) {
$major, $minor, $micro, $prerelease = ParsePythonVersion $python_version
if (($major -le 2 -and $micro -eq 0) `
-or ($major -eq 3 -and $minor -le 2 -and $micro -eq 0) `
) {
$dir = "$major.$minor"
$python_version = "$major.$minor$prerelease"
} else {
$dir = "$major.$minor.$micro"
}
if ($prerelease) {
if (($major -le 2) `
-or ($major -eq 3 -and $minor -eq 1) `
-or ($major -eq 3 -and $minor -eq 2) `
-or ($major -eq 3 -and $minor -eq 3) `
) {
$dir = "$dir/prev"
}
}
if (($major -le 2) -or ($major -le 3 -and $minor -le 4)) {
$ext = "msi"
if ($platform_suffix) {
$platform_suffix = ".$platform_suffix"
}
} else {
$ext = "exe"
if ($platform_suffix) {
$platform_suffix = "-$platform_suffix"
}
}
$filename = "python-$python_version$platform_suffix.$ext"
$url = "$BASE_URL$dir/$filename"
$filepath = Download $filename $url
return $filepath
}
function InstallPython ($python_version, $architecture, $python_home) {
Write-Host "Installing Python" $python_version "for" $architecture "bit architecture to" $python_home
if (Test-Path $python_home) {
Write-Host $python_home "already exists, skipping."
return $false
}
if ($architecture -eq "32") {
$platform_suffix = ""
} else {
$platform_suffix = "amd64"
}
$installer_path = DownloadPython $python_version $platform_suffix
$installer_ext = [System.IO.Path]::GetExtension($installer_path)
Write-Host "Installing $installer_path to $python_home"
$install_log = $python_home + ".log"
if ($installer_ext -eq '.msi') {
InstallPythonMSI $installer_path $python_home $install_log
} else {
InstallPythonEXE $installer_path $python_home $install_log
}
if (Test-Path $python_home) {
Write-Host "Python $python_version ($architecture) installation complete"
} else {
Write-Host "Failed to install Python in $python_home"
Get-Content -Path $install_log
Exit 1
}
}
function InstallPythonEXE ($exepath, $python_home, $install_log) {
$install_args = "/quiet InstallAllUsers=1 TargetDir=$python_home"
RunCommand $exepath $install_args
}
function InstallPythonMSI ($msipath, $python_home, $install_log) {
$install_args = "/qn /log $install_log /i $msipath TARGETDIR=$python_home"
$uninstall_args = "/qn /x $msipath"
RunCommand "msiexec.exe" $install_args
if (-not(Test-Path $python_home)) {
Write-Host "Python seems to be installed else-where, reinstalling."
RunCommand "msiexec.exe" $uninstall_args
RunCommand "msiexec.exe" $install_args
}
}
function RunCommand ($command, $command_args) {
Write-Host $command $command_args
Start-Process -FilePath $command -ArgumentList $command_args -Wait -Passthru
}
function InstallPip ($python_home) {
$pip_path = $python_home + "\Scripts\pip.exe"
$python_path = $python_home + "\python.exe"
if (-not(Test-Path $pip_path)) {
Write-Host "Installing pip..."
$webclient = New-Object System.Net.WebClient
$webclient.DownloadFile($GET_PIP_URL, $GET_PIP_PATH)
Write-Host "Executing:" $python_path $GET_PIP_PATH
& $python_path $GET_PIP_PATH
} else {
Write-Host "pip already installed."
}
}
function main () {
InstallPython $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON
InstallPip $env:PYTHON
}
main
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