move ParseError to own file

Author: RonnyPfannschmidt

src/iniconfig/__init__.py

@@ -23,6 +23,8 @@
 
 __all__ = ["IniConfig", "ParseError"]
 
+from .exceptions import ParseError
+
 COMMENTCHARS = "#;"
 
 _D = TypeVar("_D")
@@ -39,21 +41,6 @@ class _ParsedLine(NamedTuple):
     value: str | None
 
 
-class ParseError(Exception):
-    path: Final[str]
-    lineno: Final[int]
-    msg: Final[str]
-
-    def __init__(self, path: str, lineno: int, msg: str):
-        Exception.__init__(self, path, lineno, msg)
-        self.path = path
-        self.lineno = lineno
-        self.msg = msg
-
-    def __str__(self) -> str:
-        return f"{self.path}:{self.lineno + 1}: {self.msg}"
-
-
 class SectionWrapper:
     config: Final[IniConfig]
     name: Final[str]

src/iniconfig/exceptions.py

@@ -0,0 +1,20 @@
+
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing_extensions import Final
+
+class ParseError(Exception):
+    path: Final[str]
+    lineno: Final[int]
+    msg: Final[str]
+
+    def __init__(self, path: str, lineno: int, msg: str):
+        Exception.__init__(self, path, lineno, msg)
+        self.path = path
+        self.lineno = lineno
+        self.msg = msg
+
+    def __str__(self) -> str:
+        return f"{self.path}:{self.lineno + 1}: {self.msg}"