Start threads for %%script as daemon thread

IPython/core/magics/script.py

@@ -205,7 +205,7 b' class ScriptMagics(Magics, Configurable):'
                 self.shell.user_ns[args.out] = p.stdout
             if args.err:
                 self.shell.user_ns[args.err] = p.stderr
-            self.job_manager.new(self._run_script, p, cell)
+            self.job_manager.new(self._run_script, p, cell, daemon=True)
             if args.proc:
                 self.shell.user_ns[args.proc] = p
             return

IPython/lib/backgroundjobs.py

@@ -140,6 +140,8 b' class BackgroundJobManager(object):'
         In both cases, the result is stored in the job.result field of the
         background job object.
 
+        You can set `daemon` attribute of the thread by giving the keyword
+        argument `daemon`.
 
         Notes and caveats:
 
@@ -182,6 +184,8 b' class BackgroundJobManager(object):'
         else:
             raise TypeError('invalid args for new job')
         
+        if kwargs.get('daemon', False):
+            job.daemon = True
         job.num = len(self.all)+1 if self.all else 0
         self.running.append(job)
         self.all[job.num] = job