Bring Python into the next decade. (GH-17801)

(cherry picked from commit 946b29ea0b3b386ed05e87e60b8617c9dc19cd53)

Co-authored-by: Benjamin Peterson <benjamin@python.org>
diff --git a/Doc/copyright.rst b/Doc/copyright.rst
index 393a1f0..1b90d9f 100644
--- a/Doc/copyright.rst
+++ b/Doc/copyright.rst
@@ -4,7 +4,7 @@
 
 Python and this documentation is:
 
-Copyright © 2001-2019 Python Software Foundation. All rights reserved.
+Copyright © 2001-2020 Python Software Foundation. All rights reserved.
 
 Copyright © 2000 BeOpen.com. All rights reserved.
 
diff --git a/Doc/license.rst b/Doc/license.rst
index 810d2e6..472a5cf 100644
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -87,7 +87,7 @@
       analyze, test, perform and/or display publicly, prepare derivative works,
       distribute, and otherwise use Python |release| alone or in any derivative
       version, provided, however, that PSF's License Agreement and PSF's notice of
-      copyright, i.e., "Copyright © 2001-2019 Python Software Foundation; All Rights
+      copyright, i.e., "Copyright © 2001-2020 Python Software Foundation; All Rights
       Reserved" are retained in Python |release| alone or in any derivative version
       prepared by Licensee.
 
diff --git a/LICENSE b/LICENSE
index 9dc010d..66a3ac8 100644
--- a/LICENSE
+++ b/LICENSE
@@ -73,7 +73,7 @@
 distribute, and otherwise use Python alone or in any derivative version,
 provided, however, that PSF's License Agreement and PSF's notice of copyright,
 i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Python Software Foundation;
+2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Python Software Foundation;
 All Rights Reserved" are retained in Python alone or in any derivative version
 prepared by Licensee.
 
diff --git a/Mac/IDLE/IDLE.app/Contents/Info.plist b/Mac/IDLE/IDLE.app/Contents/Info.plist
index 04a0a08..dcc48ab 100644
--- a/Mac/IDLE/IDLE.app/Contents/Info.plist
+++ b/Mac/IDLE/IDLE.app/Contents/Info.plist
@@ -36,7 +36,7 @@
 	<key>CFBundleExecutable</key>
 	<string>IDLE</string>
 	<key>CFBundleGetInfoString</key>
-	<string>%version%, © 2001-2019 Python Software Foundation</string>
+	<string>%version%, © 2001-2020 Python Software Foundation</string>
 	<key>CFBundleIconFile</key>
 	<string>IDLE.icns</string>
 	<key>CFBundleIdentifier</key>
diff --git a/Mac/PythonLauncher/Info.plist.in b/Mac/PythonLauncher/Info.plist.in
index 9fb4e0a..21a0515 100644
--- a/Mac/PythonLauncher/Info.plist.in
+++ b/Mac/PythonLauncher/Info.plist.in
@@ -40,7 +40,7 @@
 	<key>CFBundleExecutable</key>
 	<string>Python Launcher</string>
 	<key>CFBundleGetInfoString</key>
-	<string>%VERSION%, © 2001-2019 Python Software Foundation</string>
+	<string>%VERSION%, © 2001-2020 Python Software Foundation</string>
 	<key>CFBundleIconFile</key>
 	<string>PythonLauncher.icns</string>
 	<key>CFBundleIdentifier</key>
diff --git a/Mac/Resources/app/Info.plist.in b/Mac/Resources/app/Info.plist.in
index b758198..66b5e76 100644
--- a/Mac/Resources/app/Info.plist.in
+++ b/Mac/Resources/app/Info.plist.in
@@ -37,7 +37,7 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleLongVersionString</key>
-	<string>%version%, (c) 2001-2019 Python Software Foundation.</string>
+	<string>%version%, (c) 2001-2020 Python Software Foundation.</string>
 	<key>CFBundleName</key>
 	<string>Python</string>
 	<key>CFBundlePackageType</key>
diff --git a/Python/getcopyright.c b/Python/getcopyright.c
index 27a1731..299ccc0 100644
--- a/Python/getcopyright.c
+++ b/Python/getcopyright.c
@@ -4,7 +4,7 @@
 
 static const char cprt[] =
 "\
-Copyright (c) 2001-2019 Python Software Foundation.\n\
+Copyright (c) 2001-2020 Python Software Foundation.\n\
 All Rights Reserved.\n\
 \n\
 Copyright (c) 2000 BeOpen.com.\n\
diff --git a/README.rst b/README.rst
index d14f2b3..be371c6 100644
--- a/README.rst
+++ b/README.rst
@@ -18,7 +18,7 @@
    :target: https://python.zulipchat.com
 
 
-Copyright (c) 2001-2019 Python Software Foundation.  All rights reserved.
+Copyright (c) 2001-2020 Python Software Foundation.  All rights reserved.
 
 See the end of this file for further copyright and license information.
 
@@ -246,7 +246,7 @@
 Copyright and License Information
 ---------------------------------
 
-Copyright (c) 2001-2019 Python Software Foundation.  All rights reserved.
+Copyright (c) 2001-2020 Python Software Foundation.  All rights reserved.
 
 Copyright (c) 2000 BeOpen.com.  All rights reserved.