From ff950773759423085f506ced0cc8f0f77afff5d1 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 26 Jan 2019 17:05:25 -0500
Subject: Fix pip upgrade/downgrade on Windows.

---
 pip-wrapper.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pip-wrapper.py b/pip-wrapper.py
index 5cb59640..30a56fd5 100644
--- a/pip-wrapper.py
+++ b/pip-wrapper.py
@@ -12,7 +12,13 @@ import subprocess
 
 
 def ensure_pip_version(pip_bin, ver):
-    cmd = [pip_bin, 'install', 'pip ' + ver]
+    """
+    Ensure the pip version meets the specified version.
+
+    Use python -m pip to upgrade/downgrade, because for this operation,
+    on Windows, pip.exe must not be locked.
+    """
+    cmd = [sys.executable, '-m', 'pip', 'install', 'pip ' + ver]
     subprocess.check_call(cmd)
 
 
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