From 6c5cbf09021e1571f7128ad7b782e5b13d79a8e1 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Wed, 11 Aug 2010 09:58:09 -0400
Subject: [PATCH] Allow fallback to XeX notation for efor extreme powers in
 ppSI

---
 hooke/util/si.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hooke/util/si.py b/hooke/util/si.py
index ac3e633..14d9010 100644
--- a/hooke/util/si.py
+++ b/hooke/util/si.py
@@ -127,7 +127,11 @@ def ppSI(value, unit='', decimals=None, power=None, pad=False):
                 # 1 for ' ', 1 for '-', 3 for number, 1 for '.', and decimals.
                 pad = 6 + decimals
             format = lambda n: '%*.*f' % (pad, decimals, n)
-    return '%s %s%s' % (format(value / pow(10,power)), PREFIX[power], unit)
+    try:
+        prefix = ' '+PREFIX[power]
+    except KeyError:
+        prefix = 'e%d ' % power
+    return '%s%s%s' % (format(value / pow(10,power)), prefix, unit)
 
 
 def get_power(value):
-- 
2.26.2