Avoid warnings

bob/bio/vein/configurations/fv3d.py

@@ -13,11 +13,11 @@ the link.
 
 from ..database.fv3d import Database
 
-fv3d_directory = "[YOUR_FV3D_DIRECTORY]"
+_fv3d_directory = "[YOUR_FV3D_DIRECTORY]"
 """Value of ``~/.bob_bio_databases.txt`` for this database"""
 
 database = Database(
-    original_directory = fv3d_directory,
+    original_directory = _fv3d_directory,
     original_extension = '.png',
     )
 """The :py:class:`bob.bio.base.database.BioDatabase` derivative with fv3d

bob/bio/vein/configurations/utfvp.py

@@ -19,11 +19,11 @@ You can download the raw data of the `UTFVP`_ database by following the link.
 
 from ..database.utfvp import Database
 
-utfvp_directory = "[YOUR_UTFVP_DIRECTORY]"
+_utfvp_directory = "[YOUR_UTFVP_DIRECTORY]"
 """Value of ``~/.bob_bio_databases.txt`` for this database"""
 
 database = Database(
-    original_directory = utfvp_directory,
+    original_directory = _utfvp_directory,
     original_extension = '.png',
     )
 """The :py:class:`bob.bio.base.database.BioDatabase` derivative with UTFVP settings

bob/bio/vein/configurations/verafinger.py

@@ -15,11 +15,11 @@ the link.
 
 from ..database.verafinger import Database
 
-verafinger_directory = "[YOUR_VERAFINGER_DIRECTORY]"
+_verafinger_directory = "[YOUR_VERAFINGER_DIRECTORY]"
 """Value of ``~/.bob_bio_databases.txt`` for this database"""
 
 database = Database(
-    original_directory = verafinger_directory,
+    original_directory = _verafinger_directory,
     original_extension = '.png',
     )
 """The :py:class:`bob.bio.base.database.BioDatabase` derivative with Verafinger