diff --git a/eeschema/python_scripts/bom_csv_grouped_by_value.py b/eeschema/python_scripts/bom_csv_grouped_by_value.py
index e47a93fde7..d30344a2c5 100644
--- a/eeschema/python_scripts/bom_csv_grouped_by_value.py
+++ b/eeschema/python_scripts/bom_csv_grouped_by_value.py
@@ -125,15 +125,16 @@ item = 0
 for group in grouped:
     del row[:]
     refs = ""
+    refs_l = []
 
     # Add the reference of every component in the group and keep a reference
     # to the component so that the other data can be filled in once per group
     for component in group:
-        if len(refs) > 0:
-            refs += ", "
-        refs += component.getRef()
+        refs_l.append( component.getRef() )
         c = component
-
+    
+    refs = ", ".join(refs_l)
+    
     # Fill in the component groups common data
     # columns = ['Item', 'Qty', 'Reference(s)', 'Value', 'LibPart', 'Footprint', 'Datasheet', 'DNP'] + sorted(list(columnset))
     item += 1
@@ -155,4 +156,4 @@ for group in grouped:
 f.close()
 
 if not canOpenFile:
-    sys.exit(1)
\ No newline at end of file
+    sys.exit(1)
diff --git a/eeschema/python_scripts/bom_csv_grouped_by_value_with_fp.py b/eeschema/python_scripts/bom_csv_grouped_by_value_with_fp.py
index ca0b62d37d..7815ee1a5a 100644
--- a/eeschema/python_scripts/bom_csv_grouped_by_value_with_fp.py
+++ b/eeschema/python_scripts/bom_csv_grouped_by_value_with_fp.py
@@ -60,15 +60,16 @@ grouped = net.groupComponents()
 # Output all of the component information
 for group in grouped:
     refs = ""
+    refs_l = []
 
     # Add the reference of every component in the group and keep a reference
     # to the component so that the other data can be filled in once per group
     for component in group:
-        if refs != "":
-            refs += ", "
-        refs += fromNetlistText( component.getRef() )
+        refs_l.append( fromNetlistText( component.getRef() ) )
         c = component
-
+    
+    refs = ", ".join(refs_l)
+    
     # Fill in the component groups common data
     out.writerow([refs, len(group),
         fromNetlistText( c.getValue() ),
@@ -79,4 +80,4 @@ for group in grouped:
         c.getDNPString()])
 
 if not canOpenFile:
-    sys.exit(1)
\ No newline at end of file
+    sys.exit(1)
diff --git a/eeschema/python_scripts/bom_csv_grouped_extra.py b/eeschema/python_scripts/bom_csv_grouped_extra.py
index 4516ba9303..d07b8b0421 100644
--- a/eeschema/python_scripts/bom_csv_grouped_extra.py
+++ b/eeschema/python_scripts/bom_csv_grouped_extra.py
@@ -94,16 +94,16 @@ grouped = net.groupComponents()
 index = 1
 for group in grouped:
     refs = ""
+    refs_l = []
 
     # Add the reference of every component in the group and keep a reference
     # to the component so that the other data can be filled in once per group
     for component in group:
-        refs += component.getRef() + ", "
+        refs_l.append( component.getRef() )
         c = component
-
-    # Remove trailing comma
-    refs = refs[:-2]
-
+    
+    refs = ", ".join(refs_l)
+    
     # Fill in the component groups common data
     row = []
     row.append( index )