diff --git a/python/paddle/base/backward.py b/python/paddle/base/backward.py
index 563e423e0c7ea..d6c0a61a5c92b 100755
--- a/python/paddle/base/backward.py
+++ b/python/paddle/base/backward.py
@@ -2378,7 +2378,7 @@ def _find_op_path_(
         # If block is while block, dealing with op specifically again.
         # TODO(liym27): Consider special types of ops.
         for i, op in reversed(list(enumerate(block.ops))):
-            if relevant_op_flags[i] == False and _some_in_set_(
+            if relevant_op_flags[i] is False and _some_in_set_(
                 op.desc.output_arg_names(), output_names
             ):
                 relevant_op_flags[i] = True
diff --git a/python/paddle/base/device_worker.py b/python/paddle/base/device_worker.py
index 706febd44ba0e..2397ce39b97e4 100644
--- a/python/paddle/base/device_worker.py
+++ b/python/paddle/base/device_worker.py
@@ -457,7 +457,7 @@ def _gen_worker_desc(self, trainer_desc):
             if (
                 opt_info["use_cvm"]
                 or "no_cvm" in opt_info
-                and opt_info["no_cvm"] == True
+                and opt_info["no_cvm"] is True
             ):
                 sparse_table.emb_dim = self._fleet_desc.server_param.downpour_server_param.downpour_table_param[
                     i
@@ -567,7 +567,7 @@ def _gen_worker_desc(self, trainer_desc):
             if (
                 opt_info["use_cvm"]
                 or "no_cvm" in opt_info
-                and opt_info["no_cvm"] == True
+                and opt_info["no_cvm"] is True
             ):
                 sparse_table.emb_dim = self._fleet_desc.server_param.downpour_server_param.downpour_table_param[
                     i
diff --git a/python/paddle/base/dygraph/base.py b/python/paddle/base/dygraph/base.py
index 7edb748026d84..e3b299ee4eb4b 100644
--- a/python/paddle/base/dygraph/base.py
+++ b/python/paddle/base/dygraph/base.py
@@ -908,7 +908,7 @@ def to_variable(value, name=None, zero_copy=None, dtype=None):
             # (2): when used in flask framework, it may result in hang.
             # Details: https://github.com/PaddlePaddle/Paddle/issues/26635
             # So, we temporally diable the zero_copy strategy.
-            if zero_copy == True:
+            if zero_copy is True:
                 warnings.warn(
                     "Currently, zero_copy is not supported, and it will be discarded."
                 )
diff --git a/python/paddle/base/executor.py b/python/paddle/base/executor.py
index 9ea3d566c824a..3058fb55172b7 100755
--- a/python/paddle/base/executor.py
+++ b/python/paddle/base/executor.py
@@ -1692,7 +1692,7 @@ def _run_impl(
         if isinstance(program, Program) and program._heter_pipeline_opt:
             # print("program._heter_pipeline_opt: {}".format(
             #    program._heter_pipeline_opt))
-            ## change default executor
+            # change default executor
             heter_place = program._heter_pipeline_opt["heter_place"]
             heter_place = framework._get_paddle_place(heter_place)
             p = core.Place()
@@ -1849,12 +1849,12 @@ def _run_impl(
                 varobj = global_block.vars[varname]
 
                 if (
-                    vardesc.persistable() == False
+                    vardesc.persistable() is False
                     and vardesc.type() == core.VarDesc.VarType.LOD_TENSOR
-                    and vardesc.need_check_feed() == True
-                    and varobj.stop_gradient == True
-                    and varobj.is_data == True
-                    and varobj.belong_to_optimizer == False
+                    and vardesc.need_check_feed() is True
+                    and varobj.stop_gradient is True
+                    and varobj.is_data is True
+                    and varobj.belong_to_optimizer is False
                     and varname not in feed
                 ):
                     raise ValueError('Need feed data for variable %s' % varname)
@@ -2146,7 +2146,7 @@ def _prepare_trainer(
     ):
         is_heter = 0
         use_ps_gpu = 0
-        if not program._fleet_opt is None:
+        if program._fleet_opt is not None:
             if program._fleet_opt.get("worker_class", "") == "HeterCpuWorker":
                 is_heter = 1
             if program._fleet_opt.get("trainer", "") == "HeterXpuTrainer":
@@ -2272,7 +2272,7 @@ def _run_from_dataset(
                     raise RuntimeError(
                         "dataset is need and should be initialized"
                     )
-            ## change default executor
+            # change default executor
             heter_place = framework._get_paddle_place(heter_place)
             p = core.Place()
             p.set_place(heter_place)
diff --git a/python/paddle/base/framework.py b/python/paddle/base/framework.py
index 0440af415a7d0..f847b535b0a5d 100644
--- a/python/paddle/base/framework.py
+++ b/python/paddle/base/framework.py
@@ -3011,7 +3011,7 @@ def __init__(
                     if (
                         type == 'less_than'
                         and op_attrs['force_cpu'] is not None
-                    ) or op_attrs['force_cpu'] != False:
+                    ) or op_attrs['force_cpu'] is not False:
                         warnings.warn(
                             "The Attr(force_cpu) of Op(%s) will be deprecated in the future, "
                             "please use 'device_guard' instead. 'device_guard' has higher priority when they are "
@@ -4303,7 +4303,7 @@ def _rename_var(self, name, new_name):
         return var
 
     def _remove_var(self, name, sync=True):
-        if sync == True:
+        if sync is True:
             self._sync_with_cpp()
         self.desc._remove_var(name.encode())
         del self.vars[name]
@@ -4492,7 +4492,7 @@ def _remove_op(self, index, sync=True):
         Returns:
             None
         """
-        if sync == True:
+        if sync is True:
             self._sync_with_cpp()
         self.desc._remove_op(index, index + 1)
         del self.ops[index]
diff --git a/python/paddle/base/reader.py b/python/paddle/base/reader.py
index 63b97ee2bd495..cf05e0c624ae8 100644
--- a/python/paddle/base/reader.py
+++ b/python/paddle/base/reader.py
@@ -46,7 +46,7 @@
 import logging
 import warnings
 
-### Dygraph DataLoader configs ###
+# Dygraph DataLoader configs ###
 import multiprocessing
 
 import queue
diff --git a/python/paddle/base/trainer_desc.py b/python/paddle/base/trainer_desc.py
index 48cc427ac8e7e..c5845d00719db 100644
--- a/python/paddle/base/trainer_desc.py
+++ b/python/paddle/base/trainer_desc.py
@@ -119,7 +119,7 @@ def _set_infer(self, infer):
 
     def _set_fleet_desc(self, fleet_desc):
         self._fleet_desc = fleet_desc
-        ## serialize fleet_desc
+        # serialize fleet_desc
         from google.protobuf import text_format
 
         fleet_desc_str = text_format.MessageToString(fleet_desc)
diff --git a/python/paddle/base/trainer_factory.py b/python/paddle/base/trainer_factory.py
index cf197fab524e0..a7087460d645c 100644
--- a/python/paddle/base/trainer_factory.py
+++ b/python/paddle/base/trainer_factory.py
@@ -186,7 +186,7 @@ def handler_launch_func(self, scope, handler):
         elapsed_secs = 0
         while True:
             self.running_lock.acquire()
-            if self.running == False:
+            if self.running is False:
                 break
             if elapsed_secs < period_secs:
                 # TODO(guru4elephant): needs customized condition
diff --git a/python/paddle/base/variable_index.py b/python/paddle/base/variable_index.py
index 1b3039c5a8cbe..e5fd3b055f9df 100644
--- a/python/paddle/base/variable_index.py
+++ b/python/paddle/base/variable_index.py
@@ -342,7 +342,7 @@ def get_value_for_bool_tensor(var, item):
     def idx_not_empty(var, item):
         from ..tensor import gather_nd
 
-        bool_2_idx = paddle.nonzero(item == True)
+        bool_2_idx = paddle.nonzero(item is True)
         return gather_nd(var, bool_2_idx)
 
     from paddle.static.nn import cond