Fix bug where options with a single letter were being considered as numbers.

1 files changed, 1 insertions, 1 deletions

diff --git a/argparse.py b/argparse.py
index 2ba966c..1ab2a53 100644
--- a/argparse.py
+++ b/argparse.py
@@ -1203,7 +1203,7 @@ class _ActionsContainer(object):
         self._defaults = {}
 
         # determines whether an "option" looks like a negative number
-        self._negative_number_matcher = _re.compile(r'^-\d+|-\d*.\d+$')
+        self._negative_number_matcher = _re.compile(r'^-\d+$|^-\d*\.\d+$')
 
         # whether or not there are any optionals that look like negative
         # numbers -- uses a list so it can be shared and edited