From 8f40d6682130dce5a6e5531bf3f1510a3fa2dbd4 Mon Sep 17 00:00:00 2001
From: Kenneth Reitz <me@kennethreitz.org>
Date: Thu, 26 Jan 2017 16:51:15 -0500
Subject: [PATCH] improve remove setuptools and friends

---
 pipenv/cli.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/pipenv/cli.py b/pipenv/cli.py
index 6c0bf778..2e7275e3 100644
--- a/pipenv/cli.py
+++ b/pipenv/cli.py
@@ -385,10 +385,11 @@ def do_purge(bare=False, downloads=False, allow_global=False):
     installed = freeze.split()
 
     # Remove setuptools and friends from installed, if present.
-    installed.remove('setuptools')
-    installed.remove('pip')
-    installed.remove('wheel')
-    installed.remove('six')
+    for package_name in ['setuptools', 'pip', 'wheel', 'six']:
+    try:
+        installed.remove(package_name)
+    except ValueError:
+        pass
 
     if not bare:
         click.echo('Found {0} installed package(s), purging...'.format(len(installed)))