diff --git a/libcnmc/cir_4_2015/F9.py b/libcnmc/cir_4_2015/F9.py
index e0b3c5d3..e10a5c57 100644
--- a/libcnmc/cir_4_2015/F9.py
+++ b/libcnmc/cir_4_2015/F9.py
@@ -4,10 +4,7 @@
 from libcnmc.core import StopMultiprocessBased
 from libcnmc.utils import get_srid, convert_srid, format_f, parse_geom
 
-try:
-    from cStringIO import StringIO
-except:
-    from StringIO import StringIO
+from io import BytesIO
 
 
 class F9(StopMultiprocessBased):
@@ -229,7 +226,7 @@ def writer(self):
         if self.file_output:
             fio = open(self.file_output, 'wb')
         else:
-            fio = StringIO()
+            fio = BytesIO()
         while True:
             try:
                 item = self.output_q.get()
@@ -257,7 +254,7 @@ def writer(self):
         if self.file_modificaciones:
             fio_mod = open(self.file_modificaciones, 'wb')
         else:
-            fio_mod = StringIO()
+            fio_mod = BytesIO()
 
         while True:
             try:
diff --git a/libcnmc/core/__init__.py b/libcnmc/core/__init__.py
index 2bcaa587..897e918a 100644
--- a/libcnmc/core/__init__.py
+++ b/libcnmc/core/__init__.py
@@ -4,10 +4,7 @@
 import os
 import sys
 from datetime import datetime
-try:
-    from cStringIO import StringIO
-except:
-    from StringIO import StringIO
+from io import BytesIO
 import traceback
 
 try:
@@ -141,7 +138,7 @@ def writer(self):
         if self.file_output:
             fio = open(self.file_output, 'wb')
         else:
-            fio = StringIO()
+            fio = BytesIO()
         fitxer = csv.writer(fio, delimiter=';', lineterminator='\n')
         if self.file_header:
             fitxer.writerow(self.file_header)
@@ -170,7 +167,7 @@ def writer_mod(self):
         if self.file_modificaciones:
             fio_mod = open(self.file_modificaciones, 'wb')
         else:
-            fio_mod = StringIO()
+            fio_mod = BytesIO()
 
         while True:
             try:
@@ -217,7 +214,7 @@ def calc(self):
             sys.stderr.flush()
         if self.interactive:
             sys.stderr.write("Correcte? ")
-            raw_input()
+            input()
             sys.stderr.flush()
         start = datetime.now()
         processes = [multiprocessing.Process(target=self.consumer)