From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Mon, 11 Feb 2013 22:58:06 +0000 (-0500)
Subject: - return the same error message as when running on all other pythons
X-Git-Tag: rel_0_5_0~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0b62df170100c777b4e847ff8c15a4206d450fd;p=thirdparty%2Fsqlalchemy%2Falembic.git

- return the same error message as when running on all other pythons
- changelog
---

diff --git a/alembic/config.py b/alembic/config.py
index 1b3b3413..71f2731b 100644
--- a/alembic/config.py
+++ b/alembic/config.py
@@ -246,7 +246,9 @@ class CommandLine(object):
     def main(self, argv=None):
         options = self.parser.parse_args(argv)
         if not hasattr(options, "cmd"):
-            self.parser.print_help()
+            # see http://bugs.python.org/issue9253, argparse
+            # behavior changed incompatibly in py3.3
+            self.parser.error("too few arguments")
         else:
             cfg = Config(options.config, options.name)
             self.run_cmd(cfg, options)
diff --git a/docs/build/changelog.rst b/docs/build/changelog.rst
index 15e57ddb..f092c50e 100644
--- a/docs/build/changelog.rst
+++ b/docs/build/changelog.rst
@@ -6,6 +6,15 @@ Changelog
 .. changelog::
     :version: 0.5.0
 
+    .. change::
+        :tags: bug
+        :pullreq: 27
+
+      Worked around a backwards-incompatible regression in Python3.3
+      regarding argparse; running "alembic" with no arguments
+      now yields an informative error in py3.3 as with all previous versions.
+      Courtesy Andrey Antukh.
+
     .. change::
         :tags: change