Print defaults on cmdline

conda/conda-bootstrap.py

@@ -96,8 +96,8 @@ def main():
 
   parser = argparse.ArgumentParser(description='Creates a new conda environment with the build/run/test dependencies of a package')
   parser.add_argument('name', help='name of the target environment to create')
-  parser.add_argument('python', help='version of python to build the environment for', nargs='?', default='3.6')
-  parser.add_argument('path', help='path to the directory containing the conda recipe', nargs='?', default='conda')
+  parser.add_argument('python', help='version of python to build the environment for [default: %(default)s]', nargs='?', default='3.6')
+  parser.add_argument('path', help='path to the directory containing the conda recipe [default: %(default)s]', nargs='?', default='conda')
 
   args = parser.parse_args()