only use backports.csv on python 2

modoboa/admin/management/commands/subcommands/_export.py

@@ -6,14 +6,18 @@ from __future__ import unicode_literals
 
 import sys
 
-from backports import csv
-
 from django.core.management.base import BaseCommand
+from django.utils import six
 
 from modoboa.core.extensions import exts_pool
 from modoboa.core.models import User
 from .... import models
 
+if six.PY2:
+    from backports import csv
+else:
+    import csv
+
 
 class ExportCommand(BaseCommand):
     """Command class."""

modoboa/admin/management/commands/subcommands/_import.py

@@ -8,7 +8,6 @@ import io
 import os
 
 import progressbar
-from backports import csv
 
 from django.core.management.base import BaseCommand, CommandError
 from django.utils import six
@@ -18,6 +17,11 @@ from modoboa.core.extensions import exts_pool
 from modoboa.lib.exceptions import Conflict
 from .... import signals
 
+if six.PY2:
+    from backports import csv
+else:
+    import csv
+
 
 class ImportCommand(BaseCommand):
     """Command class."""

modoboa/admin/views/export.py

@@ -4,7 +4,6 @@
 
 from __future__ import unicode_literals
 
-from backports import csv
 from rfc6266 import build_header
 
 from django.contrib.auth.decorators import (
@@ -19,6 +18,11 @@ from django.utils.translation import ugettext as _
 from ..forms import ExportDomainsForm, ExportIdentitiesForm
 from ..lib import get_domains, get_identities
 
+if six.PY2:
+    from backports import csv
+else:
+    import csv
+
 
 def _export(content, filename):
     """Export a csv file's content

modoboa/admin/views/import_.py

@@ -6,7 +6,6 @@ from __future__ import unicode_literals
 
 import io
 
-from backports import csv
 from reversion import revisions as reversion
 
 from django.contrib.auth.decorators import (
@@ -15,6 +14,7 @@ from django.contrib.auth.decorators import (
 from django.db import transaction
 from django.shortcuts import render
 from django.urls import reverse
+from django.utils import six
 from django.utils.encoding import smart_text
 from django.utils.translation import ugettext as _
 
@@ -22,6 +22,11 @@ from modoboa.lib.exceptions import Conflict, ModoboaException
 from .. import signals
 from ..forms import ImportDataForm, ImportIdentitiesForm
 
+if six.PY2:
+    from backports import csv
+else:
+    import csv
+
 
 @reversion.create_revision()
 def importdata(request, formclass=ImportDataForm):

requirements.txt

@@ -26,5 +26,5 @@ pytz
 requests
 rfc6266
 lxml
-backports.csv
+backports.csv; python_version < '3'
 chardet