$MINICONDA_URL = "http://repo.continuum.io/miniconda/"

$BASE_URL = "https://www.python.org/ftp/python/"

function DownloadMiniconda ($python_version, $platform_suffix) {

$webclient = New-Object System.Net.WebClient

if ($python_version -eq "3.4") {

$filename = "Miniconda3-3.7.3-Windows-" + $platform_suffix + ".exe"

} else {

$filename = "Miniconda-3.7.3-Windows-" + $platform_suffix + ".exe"

}

$url = $MINICONDA_URL + $filename

$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 InstallMiniconda ($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 = "x86"

} else {

$platform_suffix = "x86_64"

}

$filepath = DownloadMiniconda $python_version $platform_suffix

Write-Host "Installing" $filepath "to" $python_home

$install_log = $python_home + ".log"

$args = "/S /D=$python_home"

Write-Host $filepath $args

Start-Process -FilePath $filepath -ArgumentList $args -Wait -Passthru

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 InstallMinicondaPip ($python_home) {

$pip_path = $python_home + "\Scripts\pip.exe"

$conda_path = $python_home + "\Scripts\conda.exe"

if (-not(Test-Path $pip_path)) {

Write-Host "Installing pip..."

$args = "install --yes pip"

Write-Host $conda_path $args

Start-Process -FilePath "$conda_path" -ArgumentList $args -Wait -Passthru

} else {

Write-Host "pip already installed."

}

}

function main () {

InstallMiniconda $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON

InstallMinicondaPip $env:PYTHON

}

main