From 10145fcc3a1af522f3f2041852994fdeb811f3a4 Mon Sep 17 00:00:00 2001
From: Shantanu <hauntsaninja@users.noreply.github.com>
Date: Thu, 30 Jan 2020 18:55:57 -0800
Subject: [PATCH] webbrowser: fix platform availability, register (#3694)

* webbrowser: fix platform availability

* webbrowser: add default value to arg instance of register
---
 stdlib/2and3/webbrowser.pyi | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/stdlib/2and3/webbrowser.pyi b/stdlib/2and3/webbrowser.pyi
index 111037571..977d13630 100644
--- a/stdlib/2and3/webbrowser.pyi
+++ b/stdlib/2and3/webbrowser.pyi
@@ -4,9 +4,9 @@ from typing import Any, Optional, Callable, List, Text, Union, Sequence
 class Error(Exception): ...
 
 if sys.version_info >= (3, 7):
-    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: BaseBrowser = ..., *, preferred: bool = ...) -> None: ...
+    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: Optional[BaseBrowser] = ..., *, preferred: bool = ...) -> None: ...
 else:
-    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: BaseBrowser = ..., update_tryorder: int = ...) -> None: ...
+    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: Optional[BaseBrowser] = ..., update_tryorder: int = ...) -> None: ...
 def get(using: Optional[Text] = ...) -> BaseBrowser: ...
 def open(url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 def open_new(url: Text) -> bool: ...
@@ -85,14 +85,16 @@ class Konqueror(BaseBrowser):
 class Grail(BaseBrowser):
     def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 
-class WindowsDefault(BaseBrowser):
-    def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
+if sys.platform == 'win32':
+    class WindowsDefault(BaseBrowser):
+        def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 
-class MacOSX(BaseBrowser):
-    name: str
-    def __init__(self, name: Text) -> None: ...
-    def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
+if sys.platform == 'darwin':
+    class MacOSX(BaseBrowser):
+        name: str
+        def __init__(self, name: Text) -> None: ...
+        def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 
-class MacOSXOSAScript(BaseBrowser):
-    def __init__(self, name: Text) -> None: ...
-    def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
+    class MacOSXOSAScript(BaseBrowser):
+        def __init__(self, name: Text) -> None: ...
+        def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...