run python on windows without install and with full pip support

python_embed.ps1

# PowerShell script to download and install Python embeddable package with pip
# This script replicates the functionality of the download_extract_python() function

param(
    [string]$PythonVersion = "3.10.11",
    [string]$TargetDir = "C:\Users\Public\python-3.10.11",
    [string]$PythonUrl = "https://www.python.org/ftp/python/3.10.11/python-3.10.11-embed-amd64.zip",
    [string]$PipUrl = "https://bootstrap.pypa.io/get-pip.py"
)

# Function to write colored output
function Write-Status {
    param([string]$Message, [string]$Color = "White")
    Write-Host $Message -ForegroundColor $Color
}

# Function to download file from URL
function Download-File {
    param([string]$Url, [string]$OutFile)
    
    try {
        Write-Status "Downloading $OutFile..." "Yellow"
        Invoke-WebRequest -Uri $Url -OutFile $OutFile -UseBasicParsing
        Write-Status "Downloaded $OutFile successfully" "Green"
        return $true
    }
    catch {
        $errorMsg = $_.Exception.Message
        Write-Status "Failed to download $OutFile`: $errorMsg" "Red"
        return $false
    }
}

# Function to extract ZIP file
function Expand-ZipFile {
    param([string]$ZipPath, [string]$ExtractPath)
    
    try {
        Write-Status "Extracting $ZipPath to $ExtractPath..." "Yellow"
        Expand-Archive -Path $ZipPath -DestinationPath $ExtractPath -Force
        Write-Status "Extracted successfully" "Green"
        return $true
    }
    catch {
        $errorMsg = $_.Exception.Message
        Write-Status "Failed to extract $ZipPath`: $errorMsg" "Red"
        return $false
    }
}

# Main execution starts here
Write-Status "Starting Python embeddable package installation..." "Cyan"

# Check if Python is already installed
$PythonExePath = Join-Path $TargetDir "python.exe"
if (Test-Path $PythonExePath) {
    Write-Status "Python installation already exists at $TargetDir, skipping download and extraction..." "Yellow"
} else {
    Write-Status "Downloading and extracting Python embeddable package..." "Cyan"
    
    # Download Python package only if not already present
    $PythonZip = "python.zip"
    if (-not (Test-Path $PythonZip)) {
        if (-not (Download-File -Url $PythonUrl -OutFile $PythonZip)) {
            Write-Status "Failed to download Python package. Exiting." "Red"
            exit 1
        }
    } else {
        Write-Status "Python ZIP file already exists, skipping download..." "Yellow"
    }
    
    # Extract only if target directory doesn't exist
    if (-not (Test-Path $TargetDir)) {
        if (-not (Expand-ZipFile -ZipPath $PythonZip -ExtractPath $TargetDir)) {
            Write-Status "Failed to extract Python package. Exiting." "Red"
            exit 1
        }
        Write-Status "Python embeddable package extracted successfully." "Green"
    } else {
        Write-Status "Target directory already exists, skipping extraction..." "Yellow"
    }
}

# Check if pip is already installed
Write-Status "Checking if pip is already installed..." "Cyan"
try {
    $pipCheck = & $PythonExePath -m pip --version 2>$null
    if ($LASTEXITCODE -eq 0) {
        Write-Status "pip is already installed, skipping pip installation..." "Yellow"
        Write-Status "pip version: $pipCheck" "Green"
        exit 0
    }
} catch {
    Write-Status "pip not found, proceeding with installation..." "Yellow"
}

# Download get-pip.py if not already present
$GetPipFile = "get-pip.py"
if (-not (Test-Path $GetPipFile)) {
    Write-Status "Downloading get-pip.py..." "Cyan"
    if (-not (Download-File -Url $PipUrl -OutFile $GetPipFile)) {
        Write-Status "Failed to download get-pip.py. Exiting." "Red"
        exit 1
    }
} else {
    Write-Status "get-pip.py already exists, skipping download..." "Yellow"
}

# Copy get-pip.py to Python installation directory
$TargetGetPip = Join-Path $TargetDir "get-pip.py"
try {
    Copy-Item -Path $GetPipFile -Destination $TargetGetPip -Force
    Write-Status "Copied get-pip.py to Python installation directory" "Green"
} catch {
    $errorMsg = $_.Exception.Message
    Write-Status "Failed to copy get-pip.py`: $errorMsg" "Red"
    exit 1
}

# Execute get-pip.py
Write-Status "Installing pip..." "Cyan"
try {
    $pipOutput = & $PythonExePath $TargetGetPip 2>&1
    Write-Status "pip installation completed" "Green"
} catch {
    $errorMsg = $_.Exception.Message
    Write-Status "Failed to execute get-pip.py`: $errorMsg" "Red"
    exit 1
}

# Edit python310._pth file to allow submodules
$PthFile = Join-Path $TargetDir "python310._pth"
if (Test-Path $PthFile) {
    Write-Status "Patching python310._pth to enable site packages..." "Cyan"
    try {
        $content = Get-Content $PthFile -Raw
        $patchedContent = $content -replace '#import site', 'import site'
        Set-Content -Path $PthFile -Value $patchedContent -NoNewline
        Write-Status "Successfully patched python310._pth" "Green"
    } catch {
        $errorMsg = $_.Exception.Message
        Write-Status "Failed to patch python310._pth`: $errorMsg" "Red"
        exit 1
    }
} else {
    Write-Status "Warning: python310._pth file not found" "Yellow"
}

# Verify pip installation
Write-Status "Verifying pip installation..." "Cyan"
try {
    $pipVersionOutput = & $PythonExePath -m pip --version 2>&1
    if ($LASTEXITCODE -eq 0) {
        Write-Status "pip installed successfully" "Green"
        Write-Status "pip version: $pipVersionOutput" "Green"
    } else {
        Write-Status "pip failed to install" "Red"
        Write-Status "Error output: $pipVersionOutput" "Red"
        exit 1
    }
} catch {
    $errorMsg = $_.Exception.Message
    Write-Status "Failed to verify pip installation`: $errorMsg" "Red"
    exit 1
}

Write-Status "Python embeddable package installation completed successfully!" "Green"
Write-Status "Python location: $PythonExePath" "Cyan"
Write-Status "You can now use: & '$PythonExePath' -m pip install <package>" "Cyan"