old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from distutils.version import LooseVersion
  import re
  from django.db import connection
  
  POSTGRES_FLAG = False
  if str(connection.vendor) == 'postgresql':
      POSTGRES_FLAG = True
  try:
      import psycopg2
  
      version = re.search('([0-9.]+)', psycopg2.__version__ or "0").group(0)
      # To be able to use the Django version of JSONField, it requires to have PostgreSQL ≥ 9.4 , otherwise some issues
      #  could be faced.
      if POSTGRES_FLAG and (LooseVersion(version) >= LooseVersion('2.5.4')):
          from django.contrib.postgres.fields import JSONField
      else:
          raise ImportError
  except ImportError:
      from jsonfield.fields import JSONField
  
  
  class JSONFieldWrapper(JSONField):
      def __init__(self, *args, **kwargs):
          kwargs.update({'default': {}})
          super(JSONFieldWrapper, self).__init__(*args, **kwargs)
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from distutils.version import LooseVersion
  import re
  from django.db import connection
  
  POSTGRES_FLAG = False
  if str(connection.vendor) == 'postgresql':
      POSTGRES_FLAG = True
  try:
      import psycopg2
  
      version = re.search('([0-9.]+)', psycopg2.__version__ or "0").group(0)
      # To be able to use the Django version of JSONField, it requires to have PostgreSQL ≥ 9.4 and psycopg2 ≥ 2.5.4,
      # otherwise some issues could be faced.
      if POSTGRES_FLAG and (LooseVersion(version) >= LooseVersion('2.5.4')):
          from django.contrib.postgres.fields import JSONField
      else:
          raise ImportError
  except ImportError:
      from jsonfield.fields import JSONField
  
  
  class JSONFieldWrapper(JSONField):
      def __init__(self, *args, **kwargs):
          kwargs.update({'default': {}})
          super(JSONFieldWrapper, self).__init__(*args, **kwargs)
  
subject: Add psycopg2's version to the comment