Use six to check against string types

Author: alexei

adapters/fields.py

@@ -4,6 +4,7 @@
 import datetime
 import dateutil.parser
 from decimal import Decimal
+import six
 
 from .base import BaseField
 from .utils import EMPTY_VALUES, undefined
@@ -56,7 +57,7 @@ class DateField(BaseField):
     def prepare(self, data):
         if isinstance(data, datetime.date):
             return data
-        elif isinstance(data, str):
+        elif isinstance(data, six.string_types):
             return dateutil.parser.parse(data).date()
         else:
             raise ValueError("Invalid date argument")
@@ -66,7 +67,7 @@ class DateTimeField(BaseField):
     def prepare(self, data):
         if isinstance(data, datetime.datetime):
             return data
-        elif isinstance(data, str):
+        elif isinstance(data, six.string_types):
             return dateutil.parser.parse(data)
         else:
             raise ValueError("Invalid date argument")
@@ -95,7 +96,7 @@ class TimeField(BaseField):
     def prepare(self, data):
         if isinstance(data, datetime.time):
             return data
-        elif isinstance(data, str):
+        elif isinstance(data, six.string_types):
             return dateutil.parser.parse(data).timetz()
         else:
             raise ValueError("Invalid time argument")

requirements.txt

@@ -1,2 +1,3 @@
 future
 python-dateutil==2.6.0
+six

setup.py

@@ -19,5 +19,6 @@
     install_requires=[
         'future',
         'python-dateutil>=2.6.0',
+        'six',
     ],
 )