Add protected pprint.PrettyPrinter methods (#14228)

Author: tobixx

stdlib/pprint.pyi

@@ -1,4 +1,6 @@
 import sys
+from _typeshed import SupportsWrite
+from collections import deque
 from typing import IO
 
 __all__ = ["pprint", "pformat", "isreadable", "isrecursive", "saferepr", "PrettyPrinter", "pp"]
@@ -110,3 +112,48 @@ class PrettyPrinter:
     def isreadable(self, object: object) -> bool: ...
     def isrecursive(self, object: object) -> bool: ...
     def format(self, object: object, context: dict[int, int], maxlevels: int, level: int) -> tuple[str, bool, bool]: ...
+    def _format(
+        self, object: object, stream: SupportsWrite[str], indent: int, allowance: int, context: dict[int, int], level: int
+    ) -> None: ...
+    def _pprint_dict(
+        self,
+        object: dict[object, object],
+        stream: SupportsWrite[str],
+        indent: int,
+        allowance: int,
+        context: dict[int, int],
+        level: int,
+    ) -> None: ...
+    def _pprint_list(
+        self, object: list[object], stream: SupportsWrite[str], indent: int, allowance: int, context: dict[int, int], level: int
+    ) -> None: ...
+    def _pprint_tuple(
+        self,
+        object: tuple[object, ...],
+        stream: SupportsWrite[str],
+        indent: int,
+        allowance: int,
+        context: dict[int, int],
+        level: int,
+    ) -> None: ...
+    def _pprint_set(
+        self, object: set[object], stream: SupportsWrite[str], indent: int, allowance: int, context: dict[int, int], level: int
+    ) -> None: ...
+    def _pprint_deque(
+        self, object: deque[object], stream: SupportsWrite[str], indent: int, allowance: int, context: dict[int, int], level: int
+    ) -> None: ...
+    def _format_dict_items(
+        self,
+        items: list[tuple[object, object]],
+        stream: SupportsWrite[str],
+        indent: int,
+        allowance: int,
+        context: dict[int, int],
+        level: int,
+    ) -> None: ...
+    def _format_items(
+        self, items: list[object], stream: SupportsWrite[str], indent: int, allowance: int, context: dict[int, int], level: int
+    ) -> None: ...
+    def _repr(self, object: object, context: dict[int, int], level: int) -> str: ...
+    if sys.version_info >= (3, 10):
+        def _safe_repr(self, object: object, context: dict[int, int], maxlevels: int, level: int) -> tuple[str, bool, bool]: ...