Fix PR#31 -- zfill() mishandles empty string.

diff --git a/Lib/string.py b/Lib/string.py
index 92158ee9d3776d2947d0205a42691069b37ef47b..e449c20765693e051f6bacd30cc49317fbcf44be 100644 (file)
--- a/Lib/string.py
+++ b/Lib/string.py
@@ -475,7 +475,7 @@ def zfill(x, width):
        n = len(s)
        if n >= width: return s
        sign = ''
-       if s[0] in ('-', '+'):
+       if s[:1] in ('-', '+'):
                sign, s = s[0], s[1:]
        return sign + '0'*(width-n) + s