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images/win/scripts/Installers/Windows2016/Install-Python.ps1

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+################################################################################
+##  File:  Install-Python.ps1
+##  Team:  CI-X
+##  Desc:  Configure python on path with 3.6.* version from the tools cache
+##         Must run after tools cache is setup
+################################################################################
+
+Import-Module -Name ImageHelpers -Force
+
+$python36path = $Env:AGENT_TOOLSDIRECTORY + '/Python/3.6*/x64'
+$pythonDir = Get-Item -Path $python36path
+
+if($pythonDir -is [array])
+{
+    Write-Host "More than one python 3.6.* installations found"
+    Write-Host $pythonDir
+    exit 1
+}
+
+$currentPath = Get-MachinePath
+
+if ($currentPath | Select-String -SimpleMatch $pythonDir.FullName)
+{
+    Write-Host $pythonDir.FullName ' is already in PATH'
+    exit 0
+}
+
+Add-MachinePathItem -PathItem $pythonDir.FullName
+Add-MachinePathItem -PathItem "$($pythonDir.FullName)\Scripts"