From 8e03f33d84bc0a86da272634ee3c7b03b9a6debe Mon Sep 17 00:00:00 2001
From: Shantanu <hauntsaninja@users.noreply.github.com>
Date: Sun, 24 May 2020 17:41:45 -0700
Subject: [PATCH] difflib: update for py39 (#4067)

Adds default values, the hi params can now be None

Co-authored-by: hauntsaninja <>
---
 stdlib/2and3/difflib.pyi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/stdlib/2and3/difflib.pyi b/stdlib/2and3/difflib.pyi
index 4804ef820..110abf7a3 100644
--- a/stdlib/2and3/difflib.pyi
+++ b/stdlib/2and3/difflib.pyi
@@ -28,8 +28,10 @@ class SequenceMatcher(Generic[_T]):
     def set_seqs(self, a: Sequence[_T], b: Sequence[_T]) -> None: ...
     def set_seq1(self, a: Sequence[_T]) -> None: ...
     def set_seq2(self, b: Sequence[_T]) -> None: ...
-    def find_longest_match(self, alo: int, ahi: int, blo: int,
-                           bhi: int) -> Match: ...
+    if sys.version_info >= (3, 9):
+        def find_longest_match(self, alo: int = ..., ahi: Optional[int] = ..., blo: int = ..., bhi: Optional[int] = ...) -> Match: ...
+    else:
+        def find_longest_match(self, alo: int, ahi: int, blo: int, bhi: int) -> Match: ...
     def get_matching_blocks(self) -> List[Match]: ...
     def get_opcodes(self) -> List[Tuple[str, int, int, int, int]]: ...
     def get_grouped_opcodes(self, n: int = ...