error study script

 - python3 prints
 - settings.yml is optional
 - clarifying question

scripts/tracewin_errorstudy

 #!/usr/bin/env python
+from __future__ import print_function
 from ess import __queue_templates__
 
 def define_and_handle_args():
@@ -42,18 +43,22 @@ def create_and_copy_lattice(args, calc_dir, commented=[], extra_line=''):
     '''
     import yaml,shutil,os
 
-    # Create the lattice file from template:
-    lattice_settings=yaml.load(file(args.settings,'r').read())
-    lattice_settings['extra_line']=extra_line
+    if os.path.exists(args.settings):
+        # Create the lattice file from template:
+        lattice_settings=yaml.load(file(args.settings,'r').read())
+        lattice_settings['extra_line']=extra_line
 
-    lattice_template=file(args.lattice+'.tmp','r').read()
-    for cmd in commented:
-        lattice_template=lattice_template.replace(cmd.lower(),';'+cmd)
-        lattice_template=lattice_template.replace(cmd.upper(),';'+cmd)
+        lattice_template=file(args.lattice+'.tmp','r').read()
+        for cmd in commented:
+            lattice_template=lattice_template.replace(cmd.lower(),';'+cmd)
+            lattice_template=lattice_template.replace(cmd.upper(),';'+cmd)
 
-    file(calc_dir+'/'+args.lattice,'w').write(lattice_template.format(**lattice_settings))
+        file(os.path.join(calc_dir,args.lattice),'w').write(lattice_template.format(**lattice_settings))
 
-    shutil.copy(args.settings, calc_dir)
+        shutil.copy(args.settings, calc_dir)
+
+    else:
+        shutil.copy(args.lattice,os.path.join(calc_dir,args.lattice))
 
     for folder in os.listdir(calc_dir):
         if folder[0:15]=="Local_TraceWin_":
@@ -100,7 +105,7 @@ def delete_output_files(args,folder):
 def setup_multi(args):
     import os
 
-    print "multi study.."
+    print("multi study..")
 
     # the statistical study in TW to do, normally 14
     stat_study=args.study+13
@@ -151,7 +156,7 @@ def setup_multi(args):
     if num_jobs==0:
         raise ValueError("Could not find any simulation folders in "+args.calc_dir)
 
-    print "Total number of new jobs", num_jobs
+    print("Total number of new jobs", num_jobs)
     args.num_jobs=num_jobs
 
 def setup(args):
@@ -207,10 +212,10 @@ def setup(args):
             out.write(queue_template.format(**locals()))
 
 def ask(args):
-    print "You have now set up an error study running {} jobs in folder {}".format(args.num_jobs,args.calc_dir)
+    print("You have now set up an error study running {} jobs in folder {}".format(args.num_jobs,args.calc_dir))
     if args.multi>1:
-        print "This is a multi-error study"
-    answer=raw_input("Are you sure you want to continue? (yes/no)")
+        print("This is a multi-error study")
+    answer=raw_input("Do you want to submit the jobs immediately? (yes/no) ")
     if answer=='yes':
         return 0