abstract

src/PIL/Image.py

@@ -583,7 +583,9 @@ def _ensure_mutable(self):
         else:
             self.load()
 
-    def _dump(self, file: str | None = None, format: str | None = None, **options) -> str:
+    def _dump(
+        self, file: str | None = None, format: str | None = None, **options
+    ) -> str:
         suffix = ""
         if format:
             suffix = "." + format

src/PIL/ImageShow.py

@@ -13,12 +13,13 @@
 #
 from __future__ import annotations
 
+import abc
 import os
 import shutil
 import subprocess
 import sys
 from shlex import quote
-from typing import Any, Type
+from typing import Any
 
 from . import Image
 
@@ -181,6 +182,10 @@ class UnixViewer(Viewer):
     format = "PNG"
     options = {"compress_level": 1, "save_all": True}
 
+    @abc.abstractmethod
+    def get_command_ex(self, file: str, **options: Any) -> tuple[str, str]:
+        pass
+
     def get_command(self, file: str, **options: Any) -> str:
         command = self.get_command_ex(file, **options)[0]
         return f"({command} {quote(file)}"
@@ -209,7 +214,9 @@ class DisplayViewer(UnixViewer):
     This viewer supports the ``title`` parameter.
     """
 
-    def get_command_ex(self, file: str, title: str | None = None, **options: Any) -> tuple[str, str]:
+    def get_command_ex(
+        self, file: str, title: str | None = None, **options: Any
+    ) -> tuple[str, str]:
         command = executable = "display"
         if title:
             command += f" -title {quote(title)}"
@@ -267,7 +274,9 @@ class XVViewer(UnixViewer):
     This viewer supports the ``title`` parameter.
     """
 
-    def get_command_ex(self, file: str, title: str | None = None, **options: Any) -> tuple[str, str]:
+    def get_command_ex(
+        self, file: str, title: str | None = None, **options: Any
+    ) -> tuple[str, str]:
         # note: xv is pretty outdated.  most modern systems have
         # imagemagick's display command instead.
         command = executable = "xv"