pylint: fix singleton-comparison cases

Fix all cases of C0121 singleton-comparison.

Part of #270

Author: DifferentialOrange

tarantool/connection_pool.py

@@ -240,7 +240,7 @@ def build(self):
 
             any_pool.append(key)
 
-            if state.read_only == False:
+            if state.read_only is False:
                 rw_pool.append(key)
             else:
                 ro_pool.append(key)
@@ -620,7 +620,7 @@ def is_closed(self):
         :rtype: :obj:`bool`
         """
 
-        return all(unit.request_processing_enabled == False for unit in self.pool.values())
+        return all(unit.request_processing_enabled is False for unit in self.pool.values())
 
     def _request_process_loop(self, key, unit, last_refresh):
         """

test/suites/__init__.py

@@ -4,35 +4,35 @@
 __tmp = os.getcwd()
 os.chdir(os.path.abspath(os.path.dirname(__file__)))
 
-from .test_schema import TestSuite_Schema_UnicodeConnection
-from .test_schema import TestSuite_Schema_BinaryConnection
-from .test_dml import TestSuite_Request
-from .test_protocol import TestSuite_Protocol
-from .test_reconnect import TestSuite_Reconnect
-from .test_mesh import TestSuite_Mesh
-from .test_pool import TestSuite_Pool
-from .test_execute import TestSuite_Execute
-from .test_dbapi import TestSuite_DBAPI
-from .test_encoding import TestSuite_Encoding
-from .test_ssl import TestSuite_Ssl
-from .test_decimal import TestSuite_Decimal
-from .test_uuid import TestSuite_UUID
-from .test_datetime import TestSuite_Datetime
-from .test_interval import TestSuite_Interval
-from .test_package import TestSuite_Package
-from .test_error_ext import TestSuite_ErrorExt
-from .test_push import TestSuite_Push
-from .test_connection import TestSuite_Connection
-from .test_crud import TestSuite_Crud
+from .test_schema import TestSuiteSchemaUnicodeConnection
+from .test_schema import TestSuiteSchemaBinaryConnection
+from .test_dml import TestSuiteRequest
+from .test_protocol import TestSuiteProtocol
+from .test_reconnect import TestSuiteReconnect
+from .test_mesh import TestSuiteMesh
+from .test_pool import TestSuitePool
+from .test_execute import TestSuiteExecute
+from .test_dbapi import TestSuiteDBAPI
+from .test_encoding import TestSuiteEncoding
+from .test_ssl import TestSuiteSsl
+from .test_decimal import TestSuiteDecimal
+from .test_uuid import TestSuiteUUID
+from .test_datetime import TestSuiteDatetime
+from .test_interval import TestSuiteInterval
+from .test_package import TestSuitePackage
+from .test_error_ext import TestSuiteErrorExt
+from .test_push import TestSuitePush
+from .test_connection import TestSuiteConnection
+from .test_crud import TestSuiteCrud
 
-test_cases = (TestSuite_Schema_UnicodeConnection,
-              TestSuite_Schema_BinaryConnection,
-              TestSuite_Request, TestSuite_Protocol, TestSuite_Reconnect,
-              TestSuite_Mesh, TestSuite_Execute, TestSuite_DBAPI,
-              TestSuite_Encoding, TestSuite_Pool, TestSuite_Ssl,
-              TestSuite_Decimal, TestSuite_UUID, TestSuite_Datetime,
-              TestSuite_Interval, TestSuite_ErrorExt, TestSuite_Push,
-              TestSuite_Connection, TestSuite_Crud,)
+test_cases = (TestSuiteSchemaUnicodeConnection,
+              TestSuiteSchemaBinaryConnection,
+              TestSuiteRequest, TestSuiteProtocol, TestSuiteReconnect,
+              TestSuiteMesh, TestSuiteExecute, TestSuiteDBAPI,
+              TestSuiteEncoding, TestSuitePool, TestSuiteSsl,
+              TestSuiteDecimal, TestSuiteUUID, TestSuiteDatetime,
+              TestSuiteInterval, TestSuiteErrorExt, TestSuitePush,
+              TestSuiteConnection, TestSuiteCrud,)
 
 def load_tests(loader, tests, pattern):
     suite = unittest.TestSuite()

test/suites/test_crud.py

@@ -41,7 +41,7 @@ def setUp(self):
                                                      fetch_schema=False)
         # Time for vshard group configuration.
         time.sleep(1)
-        if self.conn.eval('return ROCKS_IMPORT_FAIL').data[0] == True:
+        if self.conn.eval('return ROCKS_IMPORT_FAIL').data[0] is True:
             raise unittest.SkipTest('The crud/vshard modules are not detected, ' +
                                     'installation via rocks install is required ' +
                                     'for CRUD testing purposes. You can use ' +