no the print in the experiment and result script are also printed

src/damaris/gui/ExperimentHandling.py

@@ -13,17 +13,41 @@ logger = logging.getLogger("damaris.experiment_handling")
 class StopExperiment(Exception):
     pass
 
+class _SandboxStdout:
+    """Redirects print() from sandboxed scripts to the GUI textview."""
+    def __init__(self, callback):
+        self._callback = callback
+        self._buffer = ""
+
+    def write(self, message):
+        self._buffer += message
+        if "\n" in self._buffer:
+            lines = self._buffer.split("\n")
+            self._buffer = lines[-1]
+            for line in lines[:-1]:
+                self._callback(line + "\n")
+
+    def flush(self):
+        if self._buffer:
+            self._callback(self._buffer)
+            self._buffer = ""
+
+    def isatty(self):
+        return False
+
+
 class ExperimentHandling(threading.Thread):
     """
     runs the experiment script in sandbox
     """
 
-    def __init__(self, script, exp_writer, data):
+    def __init__(self, script, exp_writer, data, log_callback=None):
         threading.Thread.__init__(self, name="experiment handler")
         self.script=script
         self.writer=exp_writer
         self.data=data
         self.quit_flag = threading.Event()
+        self._log_callback = log_callback
         if self.data is not None:
             self.data["__recentexperiment"]=-1
 
@@ -53,6 +77,13 @@ class ExperimentHandling(threading.Thread):
         self.location = None
         exp_iterator=None
 
+        # Redirect stdout/stderr so print() in sandboxed scripts goes to the GUI
+        _orig_stdout = sys.stdout
+        _orig_stderr = sys.stderr
+        if self._log_callback is not None:
+            sys.stdout = _SandboxStdout(self._log_callback)
+            sys.stderr = _SandboxStdout(self._log_callback)
+
         # check for time.sleep()
         try:
             tree = ast.parse(self.script)
@@ -150,3 +181,7 @@ class ExperimentHandling(threading.Thread):
         dataspace=None
         self.exp_iterator=None
         self.writer=None
+
+        # Restore stdout/stderr
+        sys.stdout = _orig_stdout
+        sys.stderr = _orig_stderr