diff --git a/grab/client.py b/grab/client.py
index 033030d1..ddbb3e79 100644
--- a/grab/client.py
+++ b/grab/client.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-from pprint import pprint  # pylint: disable=unused-import
 from typing import Any
 
 from .base import BaseClient
diff --git a/grab/document.py b/grab/document.py
index 35e68998..1ba3896b 100644
--- a/grab/document.py
+++ b/grab/document.py
@@ -144,7 +144,7 @@ def process_encoding(self, encoding: None | str = None) -> str:
         return unicodec.detect_content_encoding(
             self.get_body_chunk() or b"",
             content_type_header=(
-                self.headers.get("Content-Type", None) if self.headers else None
+                self.headers.get("Content-Type") if self.headers else None
             ),
             markup="xml" if self.document_type == "xml" else "html",
         )
@@ -262,8 +262,7 @@ def rex_text(
             if default is UNDEFINED:
                 raise DataNotFound("Regexp not found") from ex
             return default
-        else:
-            return match.group(1)
+        return match.group(1)
 
     def rex_search(
         self,
diff --git a/grab/request.py b/grab/request.py
index ec069809..ee5bf838 100644
--- a/grab/request.py
+++ b/grab/request.py
@@ -2,7 +2,7 @@
 
 from collections.abc import Mapping, MutableMapping
 from copy import copy
-from typing import Any, TypedDict, cast
+from typing import Any, TypedDict
 from urllib.parse import urlencode
 
 from urllib3.filepost import encode_multipart_formdata
@@ -139,10 +139,9 @@ def compile_request_data(  # noqa: CCR001
                         "Request.body and Request.fields could not be set both"
                     )
                 if self.multipart:
-                    req_body, content_type = encode_multipart_formdata(  # type: ignore
+                    req_body, content_type = encode_multipart_formdata(
                         self.fields
                     )
-                    req_body = cast(bytes, req_body)
                 else:
                     req_body, content_type = (
                         urlencode(self.fields).encode(),
diff --git a/grab/spider/base.py b/grab/spider/base.py
index e84394f2..66ba5bf6 100644
--- a/grab/spider/base.py
+++ b/grab/spider/base.py
@@ -442,7 +442,7 @@ def process_grab_proxy(self, task: Task, grab: Grab) -> None:
             if self.proxy_auto_change:
                 self.change_active_proxy(task, grab)
             if self.proxy:
-                raise Exception("Look like it is not called from tests")
+                raise RuntimeError("Look like it is not called from tests")
                 # grab.zzzz(
                 #    proxy=self.proxy.get_address(),
                 #    proxy_userpwd=self.proxy.get_userpwd(),
diff --git a/tests/test_spider_stat.py b/tests/test_spider_stat.py
index 04cc661e..aa82d022 100644
--- a/tests/test_spider_stat.py
+++ b/tests/test_spider_stat.py
@@ -19,7 +19,7 @@ def task_page_valid(self, _doc: Document, _task: Task) -> None:
                 self.stat.inc("foo")
 
             def task_page_fail(self, _doc: Document, _task: Task) -> None:
-                raise Exception("Shit happens!")
+                raise RuntimeError("Shit happens!")
 
         self.server.add_response(Response(), count=2)
         bot = TestSpider()
diff --git a/tests/util.py b/tests/util.py
index 619d0b9d..5dc37e2a 100644
--- a/tests/util.py
+++ b/tests/util.py
@@ -40,7 +40,7 @@ def load_test_config() -> MutableMapping[str, Any]:
     else:
         for key, val in local_config.items():
             if key in DEFAULT_CONFIG:
-                raise Exception("Invalid config key: {}".format(key))
+                raise KeyError("Invalid config key: {}".format(key))
             config[key] = val
     return config