[BE][Ez]: Apply FURB188: use str remove(pre|suf)fix (#146997)

Since we are on 3.9, we can use this nice str builtin which is more readable and more efficient.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/146997
Approved by: https://github.com/XuehaiPan, https://github.com/cyyever, https://github.com/jansel

docs/source/scripts/onnx/build_onnx_torchscript_supported_aten_op_csv_table.py

@@ -25,8 +25,7 @@ def _get_op_lists():
     supported_result = set()
     not_supported_result = set()
     for opname in all_schemas:
-        if opname.endswith("_"):
-            opname = opname[:-1]
+        opname = opname.removesuffix("_")
         if opname in symbolic_schemas:
             # Supported op
             opsets = symbolic_schemas[opname].opsets

tools/autograd/gen_autograd_functions.py

@@ -1033,16 +1033,13 @@ PyObject* THP${op}_${name}_getter(THPCppFunction *self, void *_unused) {
     )
     unpack_ivalues = []
     for typ, name in zip(apply_functional_args_ref_types, apply_functional_args):
-        if typ.endswith("&"):
-            typ = typ[:-1]
+        typ = typ.removesuffix("&")
         unpack_ivalues.append(f"auto {name} = packed_args.unpack<{typ}>();")
 
     schema_args = [f"std::array<bool, {len(input_name_to_idx)}>"]
     for typ in apply_functional_args_ref_types:
-        if typ.endswith("&"):
-            typ = typ[:-1]
-        if typ.startswith("const"):
-            typ = typ[5:]
+        typ = typ.removesuffix("&")
+        typ = typ.removeprefix("const")
         schema_args.append(typ.strip())
     compute_schema = ["std::vector<at::TypePtr> schema = {"]
     for schema_arg in schema_args:

tools/testing/clickhouse.py

@@ -11,8 +11,7 @@ def get_clickhouse_client() -> Any:
     endpoint = os.environ["CLICKHOUSE_ENDPOINT"]
     # I cannot figure out why these values aren't being handled automatically
     # when it is fine in the lambda
-    if endpoint.startswith("https://"):
-        endpoint = endpoint[len("https://") :]
+    endpoint = endpoint.removeprefix("https://")
     if endpoint.endswith(":8443"):
         endpoint = endpoint[: -len(":8443")]
     return clickhouse_connect.get_client(

tools/testing/target_determination/heuristics/filepath.py

@@ -67,8 +67,7 @@ def get_keywords(file: str) -> list[str]:
 
 
 def sanitize_name(folder_name: str) -> str:
-    if folder_name.startswith("_"):
-        folder_name = folder_name[1:]
+    folder_name = folder_name.removeprefix("_")
 
     for syn_rep, syns in keyword_synonyms.items():
         if folder_name in syns or folder_name == syn_rep:

torch/_dynamo/trace_rules.py

@@ -3185,10 +3185,8 @@ def _as_posix_path(path):
 
 
 def _strip_init_py(s):
-    # TODO: Once we require py3.9 use removesuffix instead.
     suffix = "__init__.py"
-    if s.endswith(suffix):
-        s = s[: -len(suffix)]
+    s = s.removesuffix(suffix)
     return _as_posix_path(s)
 
 

torch/cuda/__init__.py

@@ -232,8 +232,7 @@ def _sleep(cycles):
 def _extract_arch_version(arch_string: str):
     """Extracts the architecture string from a CUDA version"""
     base = arch_string.split("_")[1]
-    if base.endswith("a"):
-        base = base[:-1]
+    base = base.removesuffix("a")
     return int(base)
 
 

torch/distributed/distributed_c10d.py

@@ -5365,8 +5365,7 @@ def _find_or_create_pg_by_ranks_and_tag(
 def _get_group_tag(pg: ProcessGroup) -> str:
     """Return the tag associated with ``pg``."""
     tag = _world.pg_to_tag[pg]
-    if tag.startswith("user:"):
-        tag = tag[5:]
+    tag = tag.removeprefix("user:")
     return tag
 
 

torch/distributed/fsdp/_state_dict_utils.py

@@ -323,8 +323,7 @@ def _full_post_state_dict_hook(
         # Strip prefix out of key if needed as buffer names and param names
         # do not have prefix considered as they are not computed in `state_dict`
         # call.
-        if clean_key.startswith(clean_prefix):
-            clean_key = clean_key[len(clean_prefix) :]
+        clean_key = clean_key.removeprefix(clean_prefix)
 
         # Clone parameters before exiting the `_unshard_fsdp_state_params()` context.
         if not getattr(state_dict[fqn], "_has_been_cloned", False):

torch/export/_trace.py

@@ -188,7 +188,7 @@ def _fixup_key(x):
 def _strip_root(x):
     if isinstance(x, str) and x.startswith("_export_root"):
         stripped = x[len("_export_root") :]
-        return stripped[1:] if stripped.startswith(".") else stripped
+        return stripped.removeprefix(".")
     return x
 
 

torch/onnx/_internal/fx/passes/modularization.py

@@ -66,8 +66,7 @@ class _ModuleMeta:
         """
         # E.g., from 'L__self___h_1_mlp_c_proj' to 'h_1_mlp_c_proj'.
         name = self.module_name
-        if name.startswith("L__self___"):
-            name = name[len("L__self___") :]
+        name = name.removeprefix("L__self___")
         return name
 
     @property