Enable support for tracing in the Python target

org.lflang/src/org/lflang/TargetProperty.java

@@ -300,7 +300,7 @@ public enum TargetProperty {
      * true or false, or a dictionary of options.
      */
     TRACING("tracing", UnionType.TRACING_UNION,
-            Arrays.asList(Target.C, Target.CCPP, Target.CPP), (config, value) -> {
+            Arrays.asList(Target.C, Target.CCPP, Target.CPP, Target.Python), (config, value) -> {
                 if (value.getLiteral() != null) {
                     if (ASTUtils.toBoolean(value)) {
                         config.tracing = new TracingOptions();

org.lflang/src/org/lflang/generator/PythonGenerator.xtend

@@ -1000,8 +1000,19 @@ class PythonGenerator extends CGenerator {
      */
     override includeTargetLanguageHeaders() {
         pr('''#define MODULE_NAME LinguaFranca«topLevelName»''')
-        pr('''#define __GARBAGE_COLLECTED''')    	
+        pr('''#define __GARBAGE_COLLECTED''') 
+        if (targetConfig.tracing !== null) {
+            var filename = "";
+            if (targetConfig.tracing.traceFileName !== null) {
+                filename = targetConfig.tracing.traceFileName;
+            }
+            pr('#define LINGUA_FRANCA_TRACE ' + filename)
+        }
+
         pr('#include "pythontarget.c"')
+        if (targetConfig.tracing !== null) {
+            pr('#include "core/trace.c"')            
+        }
     }
 
     /** Generate C code from the Lingua Franca model contained by the

test/Python/src/HelloWorld.lf

@@ -1,9 +1,11 @@
-target Python;
+target Python {
+    tracing: true
+};
 reactor HelloWorld2 {
     reaction(startup) {=
         print("Hello World.")
     =}
 }
 main reactor HelloWorld {
     a = new HelloWorld2();
-}
+}