only exit on error if `interact` is False

IPython/core/shellapp.py

@@ -413,6 +413,8 b' class InteractiveShellApp(Configurable):'
                 self.log.warning("Error in executing line in user namespace: %s" %
                               line)
                 self.shell.showtraceback()
+                if not self.interact:
+                    self.exit(1)
 
         # Like Python itself, ignore the second if the first of these is present
         elif self.file_to_run:
@@ -421,7 +423,8 b' class InteractiveShellApp(Configurable):'
                 self._exec_file(fname, shell_futures=True)
             except:
                 self.shell.showtraceback(tb_offset=4)
-                self.exit(1)
+                if not self.interact:
+                    self.exit(1)
 
     def _run_module(self):
         """Run module specified at the command-line."""