Add _compat module to define text_type on Py 2 and 3.

The old way worked, but gave a linting error because unicode is not defined.

7 files changed, 17 insertions, 11 deletions

diff --git a/src/zope/i18n/__init__.py b/src/zope/i18n/__init__.py
index aed9ded..b737d00 100644
--- a/src/zope/i18n/__init__.py
+++ b/src/zope/i18n/__init__.py
@@ -17,15 +17,16 @@ import re
 
 from zope.component import queryUtility
 from zope.i18nmessageid import Message
-# I expect that MessageFactory might be there for BBB reasons, but not sure.
+# MessageFactory is not used, but it might be here for BBB reasons,
+# as it could be imported by other packages.
 from zope.i18nmessageid import MessageFactory  # noqa
 
+from zope.i18n._compat import text_type
 from zope.i18n.config import ALLOWED_LANGUAGES
 from zope.i18n.interfaces import INegotiator
 from zope.i18n.interfaces import ITranslationDomain
 from zope.i18n.interfaces import IFallbackTranslationDomainFactory
 
-text_type = str if bytes is not str else unicode
 
 # Set up regular expressions for finding interpolation variables in text.
 # NAME_RE must exactly match the expression of the same name in the
diff --git a/src/zope/i18n/_compat.py b/src/zope/i18n/_compat.py
new file mode 100644
index 0000000..00fb20f
--- /dev/null
+++ b/src/zope/i18n/_compat.py
@@ -0,0 +1,8 @@
+# This gives a linting error because unicode is not defined on Python 3:
+# text_type = str if bytes is not str else unicode
+try:
+    # Python 3
+    text_type = unicode
+except NameError:
+    # Python 2
+    text_type = str
diff --git a/src/zope/i18n/format.py b/src/zope/i18n/format.py
index eaec5d1..05431e0 100644
--- a/src/zope/i18n/format.py
+++ b/src/zope/i18n/format.py
@@ -23,10 +23,11 @@ import datetime
 import pytz
 import pytz.reference
 
+from zope.i18n._compat import text_type
 from zope.i18n.interfaces import IDateTimeFormat, INumberFormat
 from zope.interface import implementer
 
-text_type = str if bytes is not str else unicode
+
 NATIVE_NUMBER_TYPES = (int, float)
 try:
     NATIVE_NUMBER_TYPES += (long,)
diff --git a/src/zope/i18n/simpletranslationdomain.py b/src/zope/i18n/simpletranslationdomain.py
index b093db8..b20385a 100644
--- a/src/zope/i18n/simpletranslationdomain.py
+++ b/src/zope/i18n/simpletranslationdomain.py
@@ -15,13 +15,11 @@
 """
 from zope.interface import implementer
 from zope.component import getUtility
+from zope.i18n._compat import text_type
 from zope.i18n.interfaces import ITranslationDomain, INegotiator
 from zope.i18n import interpolate
 
 
-text_type = str if bytes is not str else unicode
-
-
 @implementer(ITranslationDomain)
 class SimpleTranslationDomain(object):
     """This is the simplest implementation of the ITranslationDomain I
diff --git a/src/zope/i18n/tests/test_itranslationdomain.py b/src/zope/i18n/tests/test_itranslationdomain.py
index 85e4c6a..bea5360 100644
--- a/src/zope/i18n/tests/test_itranslationdomain.py
+++ b/src/zope/i18n/tests/test_itranslationdomain.py
@@ -22,12 +22,11 @@ from zope.component.testing import PlacelessSetup
 
 from zope.schema import getValidationErrors
 
+from zope.i18n._compat import text_type
 from zope.i18n.negotiator import negotiator
 from zope.i18n.interfaces import INegotiator, IUserPreferredLanguages
 from zope.i18n.interfaces import ITranslationDomain
 
-text_type = str if bytes is not str else unicode
-
 
 @implementer(IUserPreferredLanguages)
 class Environment(object):
diff --git a/src/zope/i18n/tests/test_zcml.py b/src/zope/i18n/tests/test_zcml.py
index 0467a40..cd3d2b4 100644
--- a/src/zope/i18n/tests/test_zcml.py
+++ b/src/zope/i18n/tests/test_zcml.py
@@ -25,10 +25,10 @@ from zope.component.testing import PlacelessSetup
 from zope.configuration import xmlconfig
 
 import zope.i18n.tests
+from zope.i18n._compat import text_type
 from zope.i18n.interfaces import ITranslationDomain
 from zope.i18n import config
 
-text_type = str if bytes is not str else unicode
 
 template = """\
 <configure
diff --git a/src/zope/i18n/translationdomain.py b/src/zope/i18n/translationdomain.py
index 155e6c2..c62741b 100644
--- a/src/zope/i18n/translationdomain.py
+++ b/src/zope/i18n/translationdomain.py
@@ -19,6 +19,7 @@ import zope.interface
 
 from zope.i18nmessageid import Message
 from zope.i18n import translate, interpolate
+from zope.i18n._compat import text_type
 from zope.i18n.interfaces import ITranslationDomain, INegotiator
 
 
@@ -32,8 +33,6 @@ from zope.i18n.interfaces import ITranslationDomain, INegotiator
 # message in a catalog is not translated, tough luck, you get the msgid.
 LANGUAGE_FALLBACKS = ['en']
 
-text_type = str if bytes is not str else unicode
-
 
 @zope.interface.implementer(ITranslationDomain)
 class TranslationDomain(object):