Remove py36 code in .py files (#48426)

python/paddle/distributed/spawn.py

@@ -68,16 +68,6 @@ class ParallelEnvArgs:
         self.selected_devices = None
 
 
-def _py_supported_check():
-    if not sys.version_info >= (3, 4):
-        raise RuntimeError(
-            "Use `paddle.distributed.spawn` to start parallel training "
-            "requires python version greater than 3.4, if your python "
-            "is lower than this version, please use "
-            "`paddle.distributed.launch` instead."
-        )
-
-
 def _options_valid_check(options):
     # `print_config` keeped as a debug options, not show to users
     supported_options = [
@@ -414,7 +404,6 @@ def _func_wrapper(func, args, error_queue, return_queue, env_dict, backend):
 
 class MultiprocessContext:
     def __init__(self, processes, error_queues, return_queues):
-        _py_supported_check()
         self.error_queues = error_queues
         # NOTE(chenweihang): The `spawn` method is mainly used
         # to wrap the outermost execution function of the program for
@@ -598,13 +587,6 @@ def spawn(func, args=(), nprocs=-1, join=True, daemon=False, **options):
             if __name__ == '__main__':
                 dist.spawn(train, args=(True,), nprocs=2, gpus='4,5')
     """
-    # NOTE(chenweihang): [ why only supports python3.4+ ? ]
-    # Python supported setting the child process startup method
-    # since 3.4. The previous version can only use the default startup
-    # method, while the default startup method of Unix is fork, which
-    # cannot support CUDA runtime multi-process
-    _py_supported_check()
-
     # Give an error hint when the users enter a configuration option
     # that does not exist
     _options_valid_check(options)

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_mnist.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_mnist import TestMnist
@@ -64,7 +63,7 @@ class TestParallelDygraphMnistXPU(TestDistBase):
 
 class TestParallelDygraphMnistSpawn(TestDistSpawnRunner):
     def test_mnist_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(test_class=TestMnist, delta=1e-5)
 
 

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_no_sync.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_no_sync import TestNoSync
@@ -80,7 +79,7 @@ class TestParallelDygraphNoSyncControlFlow(TestDistBase):
 
 class TestParallelDygraphNoSyncSpawn(TestDistSpawnRunner):
     def test_no_sync_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(test_class=TestNoSync, delta=1e-5)
 
 
@@ -89,7 +88,7 @@ class TestParallelDygraphNoSyncUnusedParamSpawn(TestDistSpawnRunner):
         args.find_unused_parameters = True
 
     def test_no_sync_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestNoSyncUnusedParam, delta=1e-5
             )
@@ -100,7 +99,7 @@ class TestParallelDygraphNoSyncControlFlowSpawn(TestDistSpawnRunner):
         args.find_unused_parameters = True
 
     def test_no_sync_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestNoSyncControlFlow, delta=1e-5
             )

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_se_resnext.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_se_resnext import TestSeResNeXt
@@ -43,7 +42,7 @@ class TestParallelDygraphSeResNeXt(TestDistBase):
 
 class TestParallelDygraphSeResNeXtSpawn(TestDistSpawnRunner):
     def test_se_resnext_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestSeResNeXt, delta=0.01
             )

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_sparse_embedding.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_sparse_embedding import TestSparseEmbedding
@@ -61,7 +60,7 @@ class TestParallelDygraphSparseEmdeddingFP64(TestDistBase):
 
 class TestParallelDygraphSparseEmdeddingSpawn(TestDistSpawnRunner):
     def test_sparse_embedding_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestSparseEmbedding, delta=1e-5
             )

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_sparse_embedding_over_height.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_sparse_embedding_over_height import (
@@ -47,7 +46,7 @@ class TestParallelDygraphSparseEmdeddingOverHeight(TestDistBase):
 
 class TestParallelDygraphSparseEmdeddingOverHeightSpawn(TestDistSpawnRunner):
     def test_sparse_embedding_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestSparseEmbeddingOverHeight, delta=1e-5
             )

python/paddle/fluid/tests/unittests/collective/fleet/test_parallel_dygraph_unused_variables.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 import unittest
 
 from parallel_dygraph_unused_variables import TestSparseEmbeddingUnusedVars
@@ -51,7 +50,7 @@ class TestFleetDygraphUnusedVar(TestParallelDygraphUnusedVar):
 
 class TestSparseEmbeddingUnusedVarsSpawn(TestDistSpawnRunner):
     def test_mnist_with_spawn(self):
-        if fluid.core.is_compiled_with_cuda() and sys.version_info >= (3, 4):
+        if fluid.core.is_compiled_with_cuda():
             self.check_dist_result_with_spawn(
                 test_class=TestSparseEmbeddingUnusedVars, delta=1e-5
             )

python/paddle/fluid/tests/unittests/test_paddle_save_load.py

@@ -15,7 +15,6 @@
 import unittest
 import numpy as np
 import os
-import sys
 from io import BytesIO
 import tempfile
 
@@ -149,11 +148,7 @@ class TestSaveLoadPickle(unittest.TestCase):
         with self.assertRaises(ValueError):
             paddle.save(save_dict, path, 5)
 
-        protocols = [
-            2,
-        ]
-        if sys.version_info.major >= 3 and sys.version_info.minor >= 4:
-            protocols += [3, 4]
+        protocols = [2, 3, 4]
         for protocol in protocols:
             paddle.save(save_dict, path, pickle_protocol=protocol)
             dict_load = paddle.load(path)

python/paddle/fluid/tests/unittests/test_static_save_load.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
 
 import unittest
 import paddle
@@ -1798,11 +1797,7 @@ class TestStaticSaveLoadPickle(unittest.TestCase):
             with self.assertRaises(ValueError):
                 paddle.fluid.save(prog, path, 5)
 
-            protocols = [
-                2,
-            ]
-            if sys.version_info.major >= 3 and sys.version_info.minor >= 4:
-                protocols += [3, 4]
+            protocols = [2, 3, 4]
             for protocol in protocols:
                 paddle.fluid.save(prog, path, protocol)
                 # set var to zero

python/paddle/hapi/progressbar.py

@@ -17,7 +17,6 @@ import sys
 import time
 import numpy as np
 import struct
-from collections import namedtuple
 
 __all__ = []
 
@@ -57,16 +56,7 @@ class ProgressBar:
         )
 
     def _get_max_width(self):
-        if sys.version_info > (3, 3):
-            from shutil import get_terminal_size
-        else:
-            try:
-                from backports.shutil_get_terminal_size import get_terminal_size
-            except:
-
-                def get_terminal_size():
-                    terminal_size = namedtuple("terminal_size", "columns lines")
-                    return terminal_size(80, 24)
+        from shutil import get_terminal_size
 
         terminal_width, _ = get_terminal_size()
         terminal_width = terminal_width if terminal_width > 0 else 80

python/paddle/incubate/multiprocessing/reductions.py

@@ -18,7 +18,6 @@ import paddle
 # TODO: check serializing named tensor
 # TODO: check influence on autograd
 import sys
-import warnings
 import copy
 import threading
 from multiprocessing.util import register_after_fork
@@ -34,14 +33,6 @@ def _supported_check():
 
         return False
 
-    if not sys.version_info >= (3, 4):
-        warnings.warn(
-            "Use `paddle.multiprocessing` to share paddle tensor "
-            "requires python version greater than 3.4 ."
-            " `paddle.multiprocessing` will not take any effect !!!"
-        )
-        return False
-
     return True
 
 

python/paddle/vision/datasets/folder.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 import os
-import sys
 from PIL import Image
 
 import paddle
@@ -246,15 +245,7 @@ class DatasetFolder(Dataset):
                     and class_to_idx is a dictionary.
 
         """
-        if sys.version_info >= (3, 5):
-            # Faster and available in Python 3.5 and above
-            classes = [d.name for d in os.scandir(dir) if d.is_dir()]
-        else:
-            classes = [
-                d
-                for d in os.listdir(dir)
-                if os.path.isdir(os.path.join(dir, d))
-            ]
+        classes = [d.name for d in os.scandir(dir) if d.is_dir()]
         classes.sort()
         class_to_idx = {classes[i]: i for i in range(len(classes))}
         return classes, class_to_idx

tools/dockerfile/build_scripts/ssl-check.py

@@ -21,10 +21,6 @@ import sys
 
 print("Testing SSL certificate checking for Python:", sys.version)
 
-if sys.version_info[:2] < (2, 7) or sys.version_info[:2] < (3, 4):
-    print("This version never checks SSL certs; skipping tests")
-    sys.exit(0)
-
 if sys.version_info[0] >= 3:
     from urllib.request import urlopen