Redirect python print to Dynamo console (DynamoDS#11000)

* redirect print to DynamoConsol + update unit test

* comment updates

* Update CPythonEvaluator.cs

src/Libraries/DSCPython/CPythonEvaluator.cs

@@ -148,6 +148,8 @@ public enum EvaluationState { Begin, Success, Failed }
     public static class CPythonEvaluator
     {
         private const string DynamoSkipAttributeName = "__dynamoskipconversion__";
+        private const string DynamoPrintFuncName = "__dynamoprint__";
+        private const string NodeName = "__dynamonodename__";
         static PyScope globalScope;
         internal static readonly string globalScopeName = "global";
 
@@ -200,14 +202,16 @@ public static object EvaluatePythonScript(
                         var pythonNodeSetupCode = "import sys" + Environment.NewLine + "sys.path = sys.path[0:3]";
                         scope.Exec(pythonNodeSetupCode);
 
-                        ProcessAdditionalBindings(scope, bindingNames, bindingValues);
+                        scope.Set(NodeName, ProcessAdditionalBindings(bindingNames, bindingValues).ToPython());
 
                         int amt = Math.Min(bindingNames.Count, bindingValues.Count);
 
                         for (int i = 0; i < amt; i++)
                         {
                             scope.Set((string)bindingNames[i], InputMarshaler.Marshal(bindingValues[i]).ToPython());
                         }
+
+                        scope.Exec($"sys.stdout.prefix = {NodeName}");
 
                         try
                         {
@@ -255,6 +259,16 @@ private static PyScope CreateGlobalScope()
 import clr
 clr.setPreload(True)
 ");
+
+            // Session is null when running unit tests.
+            if (ExecutionEvents.ActiveSession != null)
+            {
+                dynamic logger = ExecutionEvents.ActiveSession.GetParameterValue(ParameterKeys.Logger);
+                Action<string> logFunction = msg => logger.Log($"{msg}", LogLevel.ConsoleOnly);
+                scope.Set(DynamoPrintFuncName, logFunction.ToPython());
+                scope.Exec(RedirectPrint());
+            }
+
             return scope;
         }
 
@@ -265,7 +279,7 @@ import clr
         /// <param name="scope">Python scope where execution will occur</param>
         /// <param name="bindingNames">List of binding names received for evaluation</param>
         /// <param name="bindingValues">List of binding values received for evaluation</param>
-        private static void ProcessAdditionalBindings(PyScope scope, IList bindingNames, IList bindingValues)
+        private static string ProcessAdditionalBindings(IList bindingNames, IList bindingValues)
         {
             const string NodeNameInput = "Name";
             string nodeName;
@@ -282,13 +296,27 @@ private static void ProcessAdditionalBindings(PyScope scope, IList bindingNames,
                 bindingValues.RemoveAt(0);
             }
 
-            // Session is null when running unit tests.
-            if (ExecutionEvents.ActiveSession != null)
-            {
-                dynamic logger = ExecutionEvents.ActiveSession.GetParameterValue(ParameterKeys.Logger);
-                Action<string> logFunction = msg => logger.Log($"{nodeName}: {msg}", LogLevel.ConsoleOnly);
-                scope.Set("DynamoPrint", logFunction.ToPython());
-            }
+            return nodeName;
+        }
+
+        private static string RedirectPrint()
+        {
+            return String.Format(@"
+import sys
+
+class DynamoStdOut:
+  def __init__(self, log_func):
+    self.text = ''
+    self.log_func = log_func
+    self.prefix = ''
+  def write(self, text):
+    if text == '\n':
+      self.log_func(self.prefix + ': ' + self.text)
+      self.text = ''
+    else:
+      self.text += text
+sys.stdout = DynamoStdOut({0})
+", DynamoPrintFuncName);
         }
 
         /// <summary>

src/Libraries/DSIronPython/IronPythonEvaluator.cs

@@ -34,6 +34,7 @@ public delegate void EvaluationEventHandler(EvaluationState state,
     [IsVisibleInDynamoLibrary(false)]
     public static class IronPythonEvaluator
     {
+        private const string DynamoPrintFuncName = "__dynamoprint__";
         /// <summary> stores a copy of the previously executed code</summary>
         private static string prev_code { get; set; }
         /// <summary> stores a copy of the previously compiled engine</summary>
@@ -127,7 +128,7 @@ public static object EvaluateIronPythonScript(
             // For backwards compatibility: "sys" was imported by default due to a bug so we keep it that way
             scope.ImportModule("sys");
 
-            ProcessAdditionalBindings(scope, bindingNames, bindingValues);
+            ProcessAdditionalBindings(scope, bindingNames, bindingValues, engine);
 
             int amt = Math.Min(bindingNames.Count, bindingValues.Count);
 
@@ -163,7 +164,7 @@ public static object EvaluateIronPythonScript(
         /// <param name="scope">Python scope where execution will occur</param>
         /// <param name="bindingNames">List of binding names received for evaluation</param>
         /// <param name="bindingValues">List of binding values received for evaluation</param>
-        private static void ProcessAdditionalBindings(ScriptScope scope, IList bindingNames, IList bindingValues)
+        private static void ProcessAdditionalBindings(ScriptScope scope, IList bindingNames, IList bindingValues, ScriptEngine engine)
         {
             const string NodeNameInput = "Name";
             string nodeName;
@@ -185,10 +186,31 @@ private static void ProcessAdditionalBindings(ScriptScope scope, IList bindingNa
             {
                 dynamic logger = ExecutionEvents.ActiveSession.GetParameterValue(ParameterKeys.Logger);
                 Action<string> logFunction = msg => logger.Log($"{nodeName}: {msg}", LogLevel.ConsoleOnly);
-                scope.SetVariable("DynamoPrint", logFunction);
+                scope.SetVariable(DynamoPrintFuncName, logFunction);
+                ScriptSource source = engine.CreateScriptSourceFromString(RedirectPrint());
+                source.Execute(scope);
             }
         }
 
+        private static string RedirectPrint()
+        {
+            return String.Format(@"
+import sys
+
+class DynamoStdOut:
+  def __init__(self, log_func):
+    self.text = ''
+    self.log_func = log_func
+  def write(self, text):
+    if text == '\n':
+      self.log_func(self.text)
+      self.text = ''
+    else:
+      self.text += text
+sys.stdout = DynamoStdOut({0})
+", DynamoPrintFuncName);
+        }
+
         #region Marshalling
 
         /// <summary>

test/Libraries/DynamoPythonTests/PythonTestsWithLogging.cs

@@ -32,7 +32,10 @@ public void DynamoPrintLogsToConsole()
             var expectedOutput = "Greeting CPython node: Hello from Python3!!!" + Environment.NewLine
                 + "Greeting IronPython node: Hello from Python2!!!" + Environment.NewLine
                 + "Greeting CPython String node: Hello from Python3!!!" + Environment.NewLine
-                + "Greeting IronPython String node: Hello from Python2!!!" + Environment.NewLine;
+                + "Greeting IronPython String node: Hello from Python2!!!" + Environment.NewLine
+                + "Multiple print parameter node: Hello Dynamo Print !!!" + Environment.NewLine
+                + "Print separator parameter node: Hello_Dynamo_Print_!!!" + Environment.NewLine
+                + @"`!""£$%^&*()_+-[{]}#~'@;:|\,<.>/? Special character node: Lot's of special characters!!!" + Environment.NewLine;
 
             CurrentDynamoModel.OpenFileFromPath(Path.Combine(TestDirectory, "core", "python", "DynamoPrint.dyn"));
             StringAssert.EndsWith(expectedOutput, CurrentDynamoModel.Logger.LogText);