diff --git a/src/zope/testbrowser/browser.py b/src/zope/testbrowser/browser.py
index b3a7248..acd7eb4 100644
--- a/src/zope/testbrowser/browser.py
+++ b/src/zope/testbrowser/browser.py
@@ -431,8 +431,8 @@ def _findByLabel(self, label, forms, include_subcontrols=False):
             control = getattr(wtcontrol, 'control', wtcontrol)
             if control.type == 'hidden':
                 continue
-            for l in wtcontrol.labels:
-                if matches(l):
+            for label in wtcontrol.labels:
+                if matches(label):
                     found.append(wtcontrol)
                     break
         return found
@@ -742,8 +742,8 @@ def __repr__(self):
 
     @Lazy
     def labels(self):
-        return [self.browser.toStr(l)
-                for l in getControlLabels(self._elem, self._form.html)]
+        return [self.browser.toStr(label)
+                for label in getControlLabels(self._elem, self._form.html)]
 
     @property
     def controls(self):
@@ -789,7 +789,7 @@ def labels(self):
         labels.append(self._control.value_if_submitted())
         if self._elem.text:
             labels.append(normalizeWhitespace(self._elem.text))
-        return [l for l in labels if l]
+        return [label for label in labels if label]
 
     def mechRepr(self):
         name = self.name if self.name is not None else "<None>"
@@ -1166,8 +1166,8 @@ def optionValue(self):
 
     @Lazy
     def labels(self):
-        return [self.browser.toStr(l)
-                for l in getControlLabels(self._elem, self._form.html)]
+        return [self.browser.toStr(label)
+                for label in getControlLabels(self._elem, self._form.html)]
 
     def __repr__(self):
         return (
@@ -1226,8 +1226,8 @@ def optionValue(self):
 
     @Lazy
     def labels(self):
-        return [self.browser.toStr(l)
-                for l in getControlLabels(self._elem, self._form.html)]
+        return [self.browser.toStr(label)
+                for label in getControlLabels(self._elem, self._form.html)]
 
     def __repr__(self):
         return (
@@ -1375,7 +1375,8 @@ def getControl(controls, label=None, value=None, index=None):
 
     if label is not None:
         options = [c for c in controls
-                   if any(isMatching(l, label) for l in c.labels)]
+                   if any(isMatching(control_label, label)
+                          for control_label in c.labels)]
         msg = 'label %r' % label
     elif value is not None:
         options = [c for c in controls if isMatching(c.value, value)]
@@ -1397,9 +1398,9 @@ def getControlLabels(celem, html):
     controlid = celem.attrs.get('id')
     if controlid:
         forlbls = html.select('label[for="%s"]' % controlid)
-        labels.extend([normalizeWhitespace(l.text) for l in forlbls])
+        labels.extend([normalizeWhitespace(label.text) for label in forlbls])
 
-    return [l for l in labels if l is not None]
+    return [label for label in labels if label is not None]
 
 
 def normalizeWhitespace(string):