From 460da7442afa5ec9923c609e51d3a81b1e547ca8 2012-06-15 00:27:52
From: MinRK <benjaminrk@gmail.com>
Date: 2012-06-15 00:27:52
Subject: [PATCH] USER in prompts default to '' instead of None
---

diff --git a/IPython/core/prompts.py b/IPython/core/prompts.py
index fbcd2a3..a7dd33a 100644
--- a/IPython/core/prompts.py
+++ b/IPython/core/prompts.py
@@ -140,7 +140,7 @@ HOME = py3compat.str_to_unicode(os.environ.get("HOME","//////:::::ZZZZZ,,,~~~"))
 # We precompute a few more strings here for the prompt_specials, which are
 # fixed once ipython starts.  This reduces the runtime overhead of computing
 # prompt strings.
-USER           = py3compat.str_to_unicode(os.environ.get("USER"))
+USER           = py3compat.str_to_unicode(os.environ.get("USER",''))
 HOSTNAME       = py3compat.str_to_unicode(socket.gethostname())
 HOSTNAME_SHORT = HOSTNAME.split(".")[0]
 ROOT_SYMBOL    = "#" if (os.name=='nt' or os.getuid()==0) else "$"