better variable name

setup.py

@@ -11,13 +11,13 @@ src_root = None
 
 from distutils.util import convert_path
 
-d = {}
+command_ns = {}
 init_path = convert_path('setuptools/command/__init__.py')
 init_file = open(init_path)
-exec(init_file.read(), d)
+exec(init_file.read(), command_ns)
 init_file.close()
 
-SETUP_COMMANDS = d['__all__']
+SETUP_COMMANDS = command_ns['__all__']
 
 import setuptools
 from setuptools.command.build_py import build_py as _build_py