Update acceptance Dockerfile to use latest Python driver (#2594)

* Update acceptance Dockerfile to use latest Python driver

* Fixed four Flake8 errors

acceptance/python/Dockerfile

@@ -5,5 +5,5 @@ RUN pip install --upgrade \
 	pycco \
 	websocket-client~=0.47.0 \
 	pytest~=3.0 \
-	bigchaindb-driver~=0.6.0 \
+	bigchaindb-driver~=0.6.2 \
 	blns

bigchaindb/backend/localmongodb/connection.py

@@ -62,7 +62,7 @@ class LocalMongoDBConnection(Connection):
         try:
             try:
                 return query.run(self.conn)
-            except pymongo.errors.AutoReconnect as exc:
+            except pymongo.errors.AutoReconnect:
                 logger.warning('Lost connection to the database, '
                                'retrying query.')
                 return query.run(self.conn)

bigchaindb/upsert_validator/validator_utils.py

@@ -57,7 +57,7 @@ def validate_asset_public_key(pk):
         if len(pk_decoded) != 32:
             raise InvalidPublicKey('Public key should be of size 32 bytes')
 
-    except binascii.Error as e:
+    except binascii.Error:
         raise InvalidPublicKey('Invalid `type` specified for public key `value`')
 
 

bigchaindb/web/websocket_server.py

@@ -134,7 +134,7 @@ def websocket_handler(request):
         except RuntimeError as e:
             logger.debug('Websocket exception: %s', str(e))
             break
-        except CancelledError as e:
+        except CancelledError:
             logger.debug('Websocket closed')
             break
         if msg.type == aiohttp.WSMsgType.CLOSED:

tests/conftest.py

@@ -415,7 +415,7 @@ def abci_http(_setup_database, _configure_bigchaindb, abci_server,
             requests.get(uri)
             return True
 
-        except requests.exceptions.RequestException as e:
+        except requests.exceptions.RequestException:
             pass
         time.sleep(1)