From d58d6f0e7e6231dd9cb0c675d0b1448971c2cacd Mon Sep 17 00:00:00 2001
From: Steve Dower <steve.dower@python.org>
Date: Tue, 21 Jul 2020 21:46:06 +0100
Subject: [PATCH 1/2] bpo-41364: Reduce import overhead of uuid module

---
 Lib/uuid.py                                        | 14 ++++++++------
 .../2020-07-21-21-45-55.bpo-41364.5O-k7A.rst       |  1 +
 2 files changed, 9 insertions(+), 6 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-07-21-21-45-55.bpo-41364.5O-k7A.rst

diff --git a/Lib/uuid.py b/Lib/uuid.py
index 9ddce813fc4692..5d1dcfa685e74f 100644
--- a/Lib/uuid.py
+++ b/Lib/uuid.py
@@ -54,10 +54,12 @@
 __author__ = 'Ka-Ping Yee <ping@zesty.ca>'
 
 # The recognized platforms - known behaviors
-_AIX     = platform.system() == 'AIX'
-_DARWIN  = platform.system() == 'Darwin'
-_LINUX   = platform.system() == 'Linux'
-_WINDOWS = platform.system() == 'Windows'
+if sys.platform in ('win32', 'darwin'):
+    _AIX = _LINUX = False
+else:
+    _platform_system = platform.system()
+    _AIX     = _platform_system == 'AIX'
+    _LINUX   = _platform_system == 'Linux'
 
 _MAC_DELIM = b':'
 _MAC_OMITS_LEADING_ZEROES = False
@@ -618,9 +620,9 @@ def _random_getnode():
 #     @unittest.skipUnless(_uuid._ifconfig_getnode in _uuid._GETTERS, ...)
 if _LINUX:
     _OS_GETTERS = [_ip_getnode, _ifconfig_getnode]
-elif _DARWIN:
+elif sys.platform == 'darwin':
     _OS_GETTERS = [_ifconfig_getnode, _arp_getnode, _netstat_getnode]
-elif _WINDOWS:
+elif sys.platform == 'win32':
     # bpo-40201: _windll_getnode will always succeed, so these are not needed
     _OS_GETTERS = []
 elif _AIX:
diff --git a/Misc/NEWS.d/next/Library/2020-07-21-21-45-55.bpo-41364.5O-k7A.rst b/Misc/NEWS.d/next/Library/2020-07-21-21-45-55.bpo-41364.5O-k7A.rst
new file mode 100644
index 00000000000000..f136e892ae5fe0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-07-21-21-45-55.bpo-41364.5O-k7A.rst
@@ -0,0 +1 @@
+Reduce import overhead of :mod:`uuid`.

From 59bc5d501365f7bdf576e01e9b779dae9df455b7 Mon Sep 17 00:00:00 2001
From: Steve Dower <steve.dower@python.org>
Date: Tue, 21 Jul 2020 23:09:47 +0100
Subject: [PATCH 2/2] Lazily import platform

---
 Lib/uuid.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/uuid.py b/Lib/uuid.py
index 5d1dcfa685e74f..5ae0a3e5fa449d 100644
--- a/Lib/uuid.py
+++ b/Lib/uuid.py
@@ -45,7 +45,6 @@
 """
 
 import os
-import platform
 import sys
 
 from enum import Enum
@@ -57,6 +56,7 @@
 if sys.platform in ('win32', 'darwin'):
     _AIX = _LINUX = False
 else:
+    import platform
     _platform_system = platform.system()
     _AIX     = _platform_system == 'AIX'
     _LINUX   = _platform_system == 'Linux'