Enable B904 check of flake8 (#165047)

The description of `B904` is `Within an except clause, raise exceptions with raise ... from err or raise ... from None to distinguish them from errors in exception handling. `

Pull Request resolved: https://github.com/pytorch/pytorch/pull/165047
Approved by: https://github.com/Lucaskabela

.flake8

@@ -12,7 +12,7 @@ ignore =
     # to line this up with executable bit
     EXE001,
     # these ignores are from flake8-bugbear; please fix!
-    B007,B008,B017,B019,B023,B028,B903,B904,B905,B906,B907,B908,B910
+    B007,B008,B017,B019,B023,B028,B903,B905,B906,B907,B908,B910
     # these ignores are from flake8-comprehensions; please fix!
     C407,
     # these ignores are from flake8-logging-format; please fix!

test/dynamo/test_exceptions.py

@@ -127,7 +127,7 @@ class ExceptionTests(torch._dynamo.test_case.TestCase):
                 x = torch.sigmoid(x)
                 try:
                     x = torch.cos(x)
-                    raise AssertionError
+                    raise AssertionError  # noqa: B904
                 except AssertionError:
                     x = torch.cos(x)
 
@@ -631,7 +631,7 @@ class ExceptionTests(torch._dynamo.test_case.TestCase):
                 raise ZeroDivisionError
             except ZeroDivisionError:
                 try:
-                    raise ValueError
+                    raise ValueError  # noqa: B904
                 except ValueError:
                     pass
                 raise
@@ -681,7 +681,7 @@ class ExceptionTests(torch._dynamo.test_case.TestCase):
                 yield 1
             except ValueError:
                 try:
-                    raise TypeError
+                    raise TypeError  # noqa: B904
                 finally:
                     pass
 
@@ -711,7 +711,7 @@ class ExceptionTests(torch._dynamo.test_case.TestCase):
                 raise ValueError
             except ValueError:
                 try:
-                    raise TypeError
+                    raise TypeError  # noqa: B904
                 finally:
                     pass
 

torch/_inductor/cpp_builder.py

@@ -579,9 +579,7 @@ def _create_if_dir_not_exist(path_dir: str) -> None:
             Path(path_dir).mkdir(parents=True, exist_ok=True)
         except OSError as exc:  # Guard against race condition
             if exc.errno != errno.EEXIST:
-                raise RuntimeError(  # noqa: TRY200 (Use `raise from`)
-                    f"Fail to create path {path_dir}"
-                )
+                raise RuntimeError(f"Fail to create path {path_dir}") from exc
 
 
 def _remove_dir(path_dir: str) -> None: