Add typing to two utility functions

pylint/config/argument.py

@@ -9,15 +9,15 @@
 
 
 import re
-from typing import Callable, Dict, List, Optional, Pattern, Union
+from typing import Callable, Dict, List, Optional, Pattern, Sequence, Union
 
 from pylint import utils as pylint_utils
 
-_ArgumentTypes = Union[str, List[str], int, Pattern[str]]
+_ArgumentTypes = Union[str, Sequence[str], int, Pattern[str]]
 """List of possible argument types."""
 
 
-def _csv_transformer(value: str) -> List[str]:
+def _csv_transformer(value: str) -> Sequence[str]:
     """Transforms a comma separated string."""
     return pylint_utils._check_csv(value)
 

pylint/reporters/text.py

@@ -108,7 +108,7 @@ def colorize_ansi(
 def colorize_ansi(
     msg: str,
     msg_style: Optional[str] = None,
-    style: Optional[str] = None,
+    style: str = "",
     *,
     color: Optional[str] = None,
 ) -> str:
@@ -119,7 +119,7 @@ def colorize_ansi(
 def colorize_ansi(
     msg: str,
     msg_style: Union[MessageStyle, str, None] = None,
-    style: Optional[str] = None,
+    style: str = "",
     **kwargs: Optional[str],
 ) -> str:
     r"""colorize message by wrapping it with ansi escape codes
@@ -267,7 +267,7 @@ def __init__(
     def __init__(
         self,
         output: Optional[TextIO] = None,
-        color_mapping: Optional[Dict[str, Tuple[Optional[str], Optional[str]]]] = None,
+        color_mapping: Optional[Dict[str, Tuple[Optional[str], str]]] = None,
     ) -> None:
         # Remove for pylint 3.0
         ...
@@ -276,7 +276,7 @@ def __init__(
         self,
         output: Optional[TextIO] = None,
         color_mapping: Union[
-            ColorMappingDict, Dict[str, Tuple[Optional[str], Optional[str]]], None
+            ColorMappingDict, Dict[str, Tuple[Optional[str], str]], None
         ] = None,
     ) -> None:
         super().__init__(output)
@@ -292,7 +292,7 @@ def __init__(
             temp_color_mapping: ColorMappingDict = {}
             for key, value in color_mapping.items():
                 color = value[0]
-                style_attrs = tuple(_splitstrip(value[1]))
+                style_attrs = tuple(_splitstrip(value[1]))  # type: ignore[arg-type]
                 temp_color_mapping[key] = MessageStyle(color, style_attrs)
             color_mapping = temp_color_mapping
         else:

pylint/utils/utils.py

@@ -23,6 +23,7 @@
     List,
     Optional,
     Pattern,
+    Sequence,
     TextIO,
     Tuple,
     TypeVar,
@@ -276,7 +277,7 @@ def get_global_option(
     return default
 
 
-def _splitstrip(string, sep=","):
+def _splitstrip(string: str, sep: str = ",") -> List[str]:
     """Return a list of stripped string by splitting the string given as
     argument on `sep` (',' by default), empty strings are discarded.
 
@@ -314,7 +315,7 @@ def _unquote(string: str) -> str:
     return string
 
 
-def _check_csv(value):
+def _check_csv(value: Union[List[str], Tuple[str], str]) -> Sequence[str]:
     if isinstance(value, (list, tuple)):
         return value
     return _splitstrip(value)