Install python for unity dependency only when editor is on Windows or Macos

com.unity.perception/Editor/Visualizer/PipAPI.cs

+#if UNITY_EDITOR_WIN || UNITY_EDITOR_OSX
 using System;
 using System.Collections.Generic;
 using System.IO;
         }
     }
 }
+#endif

com.unity.perception/Editor/Visualizer/VisualizerInstaller.cs

+#if UNITY_EDITOR_WIN || UNITY_EDITOR_OSX || true
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 
             EditorUtility.DisplayProgressBar("Setting up the Visualizer", "Installing the Visualizer...", 2.5f / steps);
     #if UNITY_EDITOR_WIN
-            ExecuteCMD($"\"{packagesPath}\"\\pip3.bat install --upgrade --no-warn-script-location unity-cv-datasetvisualizer", ref ExitCode, ref output);
+            ExecuteCMD($"\"{packagesPath}\"\\pip3.bat install --upgrade --no-warn-script-location unity-cv-datasetvisualizer", ref ExitCode, ref output, waitForExit: 0);
-            ExecuteCMD($"cd \'{packagesPath}\'; ./python3.7 -m pip install --upgrade unity-cv-datasetvisualizer", ref ExitCode, ref output);
+            ExecuteCMD($"cd \'{packagesPath}\'; ./python3.7 -m pip install --upgrade unity-cv-datasetvisualizer", ref ExitCode, ref output, waitForExit: 0);
     #endif
             if (ExitCode != 0) {
                 EditorUtility.ClearProgressBar();
             EditorUtility.ClearProgressBar();
-	    UnityEngine.Debug.Log("Successfully installed visualizer");
+	        UnityEngine.Debug.Log("Successfully installed visualizer");
         }
 
         /// <summary>
             info.CreateNoWindow = !displayWindow;
             info.UseShellExecute = false;
             info.RedirectStandardOutput = getOutput;
-            info.RedirectStandardError = waitForExit == 0;
+            info.RedirectStandardError = waitForExit != 0;
-            if (!(waitForExit != 0))
+            if (waitForExit == 0)
             {
                 return cmd.Id;
             }
-            if (getOutput) {
+            if (getOutput && waitForExit != 0) {
                 output = cmd.StandardOutput.ReadToEnd();
             }
 
 
             return 0;
         }
+
+
         /// <summary>
         /// If an instance is already running for this project it opens the browser at the correct port
         /// If no instance is found it launches a new process
-        {
+        {            
             if (!checkIfVisualizerInstalled())
             {
                 SetupVisualizer();
         }
     }
 }
+#endif

com.unity.perception/package.json

     "com.unity.render-pipelines.core": "7.1.6",
     "com.unity.simulation.capture": "0.0.10-preview.23",
     "com.unity.simulation.client": "0.0.10-preview.10",
-    "com.unity.simulation.core": "0.0.10-preview.22",
-    "com.unity.scripting.python": "4.0.0-exp.5"
+    "com.unity.simulation.core": "0.0.10-preview.22"
   },
   "description": "Tools for generating large-scale data sets for perception-based machine learning training and validation",
   "displayName": "Perception",
       "path": "Samples~/Human Pose Labeling and Randomization"
     }
   ]
-}
+}

com.unity.perception/Editor/Visualizer/PythonForUnityInstaller.cs

+#if UNITY_EDITOR_WIN || UNITY_EDITOR_OSX || true
+using System;
+using UnityEditor;
+using UnityEditor.PackageManager.Requests;
+using UnityEditor.PackageManager;
+using UnityEngine;
+using System.Threading;
+
+namespace UnityEditor.Perception.Visualizer
+{
+#if UNITY_EDITOR_WIN || UNITY_EDITOR_OSX
+    [InitializeOnLoad]
+#endif
+    internal static class PythonForUnityInstaller
+    {
+#if UNITY_EDITOR_WIN || UNITY_EDITOR_OSX
+        static PythonForUnityInstaller()
+        {
+            Add();
+        }
+#endif
+        
+        internal static void Add()
+        {
+            if (!checkIfPackageInstalled())
+            {
+                AddRequest request = Client.Add("com.unity.scripting.python@4.0.0-exp.5");
+                
+                EditorUtility.DisplayProgressBar("Setting up the Visualizer", "Installing the Visualizer...", 0.2f);
+
+                while (!request.IsCompleted)
+                {
+                    Thread.Sleep(100);
+                }
+                if (request.Status == StatusCode.Success)
+                    Debug.Log("Installed: " + request.Result.packageId);
+                else if (request.Status >= StatusCode.Failure)
+                    Debug.Log(request.Error.message);
+            }
+        }
+
+        static bool checkIfPackageInstalled()
+        {
+            ListRequest request = Client.List();
+            while (!request.IsCompleted)
+            {
+                Thread.Sleep(100);
+            }
+            if (request.Status == StatusCode.Success)
+            {
+                foreach (var package in request.Result)
+                {
+                    if (package.packageId.Contains("com.unity.scripting.python"))
+                    {
+                        return true;
+                    }
+                }
+            }
+            else if (request.Status >= StatusCode.Failure)
+                Debug.LogError(request.Error.message);
+            return false;
+        }
+    }
+}
+#endif

com.unity.perception/Editor/Visualizer/PythonForUnityInstaller.cs.meta

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