diff --git a/src/pip/_internal/basecommand.py b/src/pip/_internal/basecommand.py
index 64411697b..c325f1efa 100644
--- a/src/pip/_internal/basecommand.py
+++ b/src/pip/_internal/basecommand.py
@@ -240,7 +240,7 @@ class Command(object):
             logger.debug('Exception information:', exc_info=True)
 
             return ERROR
-        except:
+        except Exception:
             logger.critical('Exception:', exc_info=True)
 
             return UNKNOWN_ERROR
diff --git a/src/pip/_internal/compat.py b/src/pip/_internal/compat.py
index 749115075..e6c008d3b 100644
--- a/src/pip/_internal/compat.py
+++ b/src/pip/_internal/compat.py
@@ -217,7 +217,7 @@ else:
                     'hh',
                     fcntl.ioctl(fd, termios.TIOCGWINSZ, '12345678')
                 )
-            except:
+            except Exception:
                 return None
             if cr == (0, 0):
                 return None
@@ -228,7 +228,7 @@ else:
                 fd = os.open(os.ctermid(), os.O_RDONLY)
                 cr = ioctl_GWINSZ(fd)
                 os.close(fd)
-            except:
+            except Exception:
                 pass
         if not cr:
             cr = (os.environ.get('LINES', 25), os.environ.get('COLUMNS', 80))
diff --git a/src/pip/_internal/req/__init__.py b/src/pip/_internal/req/__init__.py
index c9b4c3ce3..b270498e2 100644
--- a/src/pip/_internal/req/__init__.py
+++ b/src/pip/_internal/req/__init__.py
@@ -48,7 +48,7 @@ def install_given_reqs(to_install, install_options, global_options=(),
                     *args,
                     **kwargs
                 )
-            except:
+            except Exception:
                 should_rollback = (
                     requirement.conflicts_with and
                     not requirement.install_succeeded
diff --git a/src/pip/_internal/wheel.py b/src/pip/_internal/wheel.py
index 667385976..7ad7a1b8a 100644
--- a/src/pip/_internal/wheel.py
+++ b/src/pip/_internal/wheel.py
@@ -506,8 +506,8 @@ if __name__ == '__main__':
                     row[1], row[2] = rehash(row[0])
                 writer.writerow(row)
             for f in generated:
-                h, l = rehash(f)
-                writer.writerow((normpath(f, lib_dir), h, l))
+                digest, length = rehash(f)
+                writer.writerow((normpath(f, lib_dir), digest, length))
             for f in installed:
                 writer.writerow((installed[f], '', ''))
     shutil.move(temp_record, record)
@@ -528,7 +528,7 @@ def wheel_version(source_dir):
         version = wheel_data['Wheel-Version'].strip()
         version = tuple(map(int, version.split('.')))
         return version
-    except:
+    except Exception:
         return False
 
 
@@ -653,7 +653,7 @@ class WheelBuilder(object):
                     )
                     logger.info('Stored in directory: %s', output_dir)
                     return wheel_path
-                except:
+                except Exception:
                     pass
             # Ignore return, we can't do anything else useful.
             self._clean_one(req)
@@ -685,7 +685,7 @@ class WheelBuilder(object):
                 call_subprocess(wheel_args, cwd=req.setup_py_dir,
                                 show_stdout=False, spinner=spinner)
                 return True
-            except:
+            except Exception:
                 spinner.finish("error")
                 logger.error('Failed building wheel for %s', req.name)
                 return False
@@ -698,7 +698,7 @@ class WheelBuilder(object):
         try:
             call_subprocess(clean_args, cwd=req.source_dir, show_stdout=False)
             return True
-        except:
+        except Exception:
             logger.error('Failed cleaning build dir for %s', req.name)
             return False
 
diff --git a/tests/unit/test_req_file.py b/tests/unit/test_req_file.py
index 93fec8e73..3f7c293b5 100644
--- a/tests/unit/test_req_file.py
+++ b/tests/unit/test_req_file.py
@@ -639,7 +639,7 @@ class TestParseRequirements(object):
             popen.return_value.stdout.readline.return_value = b""
             try:
                 req.install([])
-            except:
+            except Exception:
                 pass
 
             last_call = popen.call_args_list[-1]
diff --git a/tests/unit/test_req_uninstall.py b/tests/unit/test_req_uninstall.py
index 5e165d8c1..dc8517961 100644
--- a/tests/unit/test_req_uninstall.py
+++ b/tests/unit/test_req_uninstall.py
@@ -121,12 +121,12 @@ class TestUninstallPathSet(object):
         f = os.path.join(tmpdir, 'foo')
         with open(f, 'w'):
             pass
-        l = os.path.join(tmpdir, 'foo_link')
-        os.symlink(f, l)
+        foo_link = os.path.join(tmpdir, 'foo_link')
+        os.symlink(f, foo_link)
 
         ups = UninstallPathSet(dist=Mock())
-        ups.add(l)
-        assert ups.paths == {l}
+        ups.add(foo_link)
+        assert ups.paths == {foo_link}
 
     def test_compact_shorter_path(self, monkeypatch):
         monkeypatch.setattr(pip._internal.req.req_uninstall, 'is_local',