Flake8 the code.

Including using the more modern style of writing binary operators at the beginning of the line.

.travis.yml

@@ -9,6 +9,11 @@ matrix:
         - python: "3.7"
           dist: xenial
           sudo: true
+         - python: 3.6
+           name: "Flake8"
+           install:  pip install -U flake8
+           script: flake8 --doctests src setup.py
+           after_success:
 install:
     - pip install six==1.10.0 # force here to avoid conflit with zc.recipe.testrunner
     - pip install zc.buildout

setup.cfg

@@ -4,7 +4,7 @@ ignore =
     bootstrap.py
 
 [flake8]
-ignore = E301
+ignore = W503 # line break before binary operator
 exclude = bootstrap.py
 
 [bdist_wheel]

setup.py

@@ -22,8 +22,9 @@
     description="Zope's indexing and search solution.",
     author='Zope Foundation and Contributors',
     author_email='zope-dev@zope.org',
-    long_description=(open('README.rst').read() + '\n' +
-                      open('CHANGES.rst').read()),
+    long_description=(open('README.rst').read()
+                      + '\n'
+                      + open('CHANGES.rst').read()),
     packages=find_packages('src'),
     namespace_packages=['Products'],
     package_dir={'': 'src'},

src/Products/PluginIndexes/DateRangeIndex/tests.py

@@ -58,8 +58,8 @@ def matchingDummiesByTimeValue(value, precision=1):
     for i, dummy in dummies:
         start = datetime_to_minutes(dummy.start(), precision)
         stop = datetime_to_minutes(dummy.stop(), precision)
-        if ((start is None or start <= value) and
-                (stop is None or stop >= value)):
+        if ((start is None or start <= value)
+                and (stop is None or stop >= value)):
             result.append((i, dummy))
     return result
 

src/Products/ZCTextIndex/BaseIndex.py

@@ -274,8 +274,8 @@ def _add_wordinfo(self, wid, f, docid):
             # Obscure:  First check the type.  If it's not a dict, it
             # can't need conversion, and then we can avoid an expensive
             # len(IIBTree).
-            if (isinstance(doc2score, type({})) and
-                    len(doc2score) == self.DICT_CUTOFF):
+            if (isinstance(doc2score, type({}))
+                    and len(doc2score) == self.DICT_CUTOFF):
                 doc2score = IIBTree(doc2score)
         doc2score[docid] = f
         self._wordinfo[wid] = doc2score  # not redundant:  Persistency!
@@ -297,8 +297,8 @@ def _mass_add_wordinfo(self, wid2weight, docid):
             if doc2score is None:
                 doc2score = {}
                 new_word_count += 1
-            elif (isinstance(doc2score, dicttype) and
-                  len(doc2score) == self.DICT_CUTOFF):
+            elif (isinstance(doc2score, dicttype)
+                    and len(doc2score) == self.DICT_CUTOFF):
                 doc2score = IIBTree(doc2score)
             doc2score[docid] = weight
             self._wordinfo[wid] = doc2score  # not redundant:  Persistency!

src/Products/ZCTextIndex/ZCTextIndex.py

@@ -113,10 +113,9 @@ def __init__(self, id, extra=None, caller=None, index_factory=None,
 
         self.index = self._index_factory(aq_base(self.getLexicon()))
 
-    security.declarePrivate('getLexicon')
+    @security.private
     def getLexicon(self):
-        """Get the lexicon for this index
-        """
+        """Get the lexicon for this index."""
         if hasattr(aq_base(self), 'lexicon'):
             # Fix up old ZCTextIndexes by removing direct lexicon ref
             # and changing it to an ID
@@ -144,7 +143,7 @@ def getLexicon(self):
 
     # External methods not in the Pluggable Index API
 
-    security.declareProtected(search_zcatalog, 'query')
+    @security.protected(search_zcatalog)
     def query(self, query, nbest=10):
         """Return pair (mapping from docids to scores, num results).
 
@@ -348,7 +347,7 @@ def getPipelineNames(self):
 
     _queryLexicon = DTMLFile('dtml/queryLexicon', globals())
 
-    security.declareProtected(LexiconQueryPerm, 'queryLexicon')
+    @security.protected(LexiconQueryPerm)
     def queryLexicon(self, REQUEST, words=None, page=0, rows=20, cols=4):
         """Lexicon browser/query user interface
         """
@@ -363,8 +362,9 @@ def queryLexicon(self, REQUEST, words=None, page=0, rows=20, cols=4):
         word_count = len(words)
         rows = max(min(rows, 500), 1)
         cols = max(min(cols, 12), 1)
-        page_count = (word_count / (rows * cols) +
-                      (word_count % (rows * cols) > 0))
+        page_count = (word_count
+                      / (rows * cols)
+                      + (word_count % (rows * cols) > 0))
         page = max(min(page, page_count - 1), 0)
         start = rows * cols * page
         end = min(rows * cols * (page + 1), word_count)

src/Products/ZCTextIndex/tests/testZCTextIndex.py

@@ -284,6 +284,7 @@ def testLexiconIsNotFoundRaisesLookupError(self):
 
     def testInvalidIndexTypeRaisesValueError(self):
         caller = LexiconHolder(self.lexicon)
+
         class Extra(object):
             index_type = 'Some invalid index type'
         with self.assertRaises(ValueError):

src/Products/ZCatalog/ProgressHandler.py

@@ -11,6 +11,7 @@
 #
 ##############################################################################
 
+from __future__ import print_function
 import sys
 import time
 from logging import getLogger
@@ -52,15 +53,16 @@ def report(self, current, *args, **kw):
                 if self.savepoint:
                     transaction.savepoint(optimistic=True)
                 seconds_so_far = time.time() - self._start
-                seconds_to_go = (seconds_so_far / current *
-                                 (self._max - current))
+                seconds_to_go = (seconds_so_far
+                                 / current
+                                 * (self._max - current))
                 end = DateTime(time.time() + seconds_to_go)
                 self.output('%d/%d (%.2f%%) Estimated termination: %s' %
                             (current, self._max, (100.0 * current / self._max),
                              end.strftime('%Y/%m/%d %H:%M:%Sh')))
 
     def output(self, text):
-        print >> self.fp, '%s: %s' % (self._ident, text)
+        print('%s: %s' % (self._ident, text), file=self.fp)
 
 
 class ZLogHandler(StdoutHandler):