Fix linting errors.

setup.py

@@ -16,10 +16,12 @@
 
 from setuptools import setup, find_packages
 
+
 def read(*rnames):
     with open(os.path.join(os.path.dirname(__file__), *rnames)) as f:
         return f.read()
 
+
 setup(
     name='zope.browser',
     version='2.4.dev0',
@@ -42,10 +44,10 @@ def read(*rnames):
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Natural Language :: English',
@@ -56,7 +58,15 @@ def read(*rnames):
     url='https://zopebrowser.readthedocs.io',
     packages=find_packages('src'),
     package_dir={'': 'src'},
-    namespace_packages=['zope',],
+    namespace_packages=['zope'],
+    python_requires=', '.join([
+        '>=2.7',
+        '!=3.0.*',
+        '!=3.1.*',
+        '!=3.2.*',
+        '!=3.3.*',
+        '!=3.4.*',
+    ]),
     install_requires=[
         'setuptools',
         'zope.interface',

src/zope/__init__.py

@@ -1,7 +1 @@
-# this is a namespace package
-try:
-    import pkg_resources
-    pkg_resources.declare_namespace(__name__)
-except ImportError:
-    import pkgutil
-    __path__ = pkgutil.extend_path(__path__, __name__)
+__import__('pkg_resources').declare_namespace(__name__)  # pragma: nocover

src/zope/browser/interfaces.py

@@ -13,28 +13,30 @@
 ##############################################################################
 """Shared dependency less Zope3 brwoser components.
 """
-__docformat__ = 'restructuredtext'
-
 from zope.interface import Attribute
 from zope.interface import Interface
 
+
 class IView(Interface):
     """ Views are multi-adapters for context and request objects.
     """
     context = Attribute("The context object the view renders")
     request = Attribute("The request object driving the view")
 
+
 class IBrowserView(IView):
     """ Views which are specialized for requests from a browser
 
     Such views are distinct from those geerated via WebDAV, FTP, XML-RPC,
     etc.
     """
 
+
 class IAdding(IBrowserView):
     """ Multi-adapter interface for views which add items to containers.
 
-    The 'context' of the view must implement :obj:`zope.container.interfaces.IContainer`.
+    The 'context' of the view must implement
+    :obj:`zope.container.interfaces.IContainer`.
     """
 
     def add(content):
@@ -68,8 +70,7 @@ def nextURL():
         """
 
     def nameAllowed():
-        """Return whether names can be input by the user.
-        """
+        """Return whether names can be input by the user."""
 
     def addingInfo():
         """Return add menu data as a sequence of mappings.
@@ -83,7 +84,9 @@ def isSingleMenuItem():
         """Return whether there is single menu item or not."""
 
     def hasCustomAddView():
-        "This should be called only if there is ``singleMenuItem`` else return 0"
+        """This should be called only if there is ``singleMenuItem``
+        else return 0.
+        """
 
 
 class ITerms(Interface):
@@ -103,10 +106,10 @@ def getValue(token):
         LookupError is raised if there isn't a value in the source.
         """
 
+
 class ISystemErrorView(Interface):
     """Error views that can classify their contexts as system errors
     """
 
     def isSystemError():
-        """Return a boolean indicating whether the error is a system errror
-        """
+        """Return a boolean indicating whether the error is a system error."""

src/zope/browser/tests.py

@@ -20,10 +20,6 @@ def test_suite():
     return unittest.TestSuite((
         doctest.DocFileSuite(
             'README.rst',
-            optionflags=doctest.NORMALIZE_WHITESPACE|doctest.ELLIPSIS,
+            optionflags=doctest.NORMALIZE_WHITESPACE | doctest.ELLIPSIS,
         ),
     ))
-
-
-if __name__ == '__main__':
-    unittest.main(defaultTest='test_suite')