Make client directory private

Author: sgillies

planet/clients/__init__.py

@@ -12,6 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 from .data import DataClient
 from .orders import OrdersClient
 from .subscriptions import SubscriptionsClient
@@ -23,7 +24,7 @@
 ]
 
 # Organize client classes by their module name to allow concise lookup.
-client_directory = {
+_client_directory = {
     'data': DataClient,
     'orders': OrdersClient,
     'subscriptions': SubscriptionsClient

planet/http.py

@@ -431,10 +431,10 @@ def client(self,
 
         """
         # To avoid circular dependency.
-        from planet.clients import client_directory
+        from planet.clients import _client_directory
 
         try:
-            return client_directory[name](self, base_url=base_url)
+            return _client_directory[name](self, base_url=base_url)
         except KeyError:
             raise exceptions.ClientError("No such client.")