Add Docstrings to validations_libs/group.py file

Change-Id: I857a54eb2b42acbcad19f3b16b1aa9e6922dc1b9
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>

validations_libs/group.py

@@ -20,7 +20,25 @@ LOG = logging.getLogger(__name__ + ".Group")
 
 
 class Group(object):
+    """An object for encapsulating the groups of validation
 
+    The validations can be grouped together by specifying a ``groups``
+    metadata. These ``groups`` are referenced in a ``groups.yaml`` file on the
+    filesystem.
+
+    .. code-block:: yaml
+
+        group1:
+        - description: >-
+            Description of the group1
+        group2:
+        - description: >-
+            Description of the group2
+        group3:
+        - description: >-
+            Description of the group3
+
+    """
     def __init__(self, groups):
         self.data = self._get_content(groups)
 
@@ -33,13 +51,53 @@ class Group(object):
 
     @property
     def get_data(self):
+        """Get the full content of the ``groups.yaml`` file
+
+        :return: The content of the ``groups.yaml`` file
+        :rtype: `dict`
+
+        :Example:
+
+        >>> groups = "/foo/bar/groups.yaml"
+        >>> grp = Group(groups)
+        >>> print(grp.get_data)
+        {'group1': [{'description': 'Description of the group1'}],
+         'group2': [{'description': 'Description of the group2'}],
+         'group3': [{'description': 'Description of the group3'}]}
+        """
         return self.data
 
     @property
     def get_formated_group(self):
+        """Get a formated content for output display
+
+        :return:
+        :rtype: `list` of `tuples`
+
+        :Example:
+
+        >>> groups = "/foo/bar/groups.yaml"
+        >>> grp = Group(groups)
+        >>> print(grp.get_formated_group)
+        [('group1', 'Description of the group1'),
+         ('group2', 'Description of the group2'),
+         ('group3', 'Description of the group3')]
+        """
         return [(gp_n, gp_d[0].get('description'))
                 for (gp_n, gp_d) in sorted(self.data.items())]
 
     @property
     def get_groups_keys_list(self):
+        """Get the list of the group name only
+
+        :return: The list of the group name
+        :rtype: `list`
+
+        :Example:
+
+        >>> groups = "/foo/bar/groups.yaml"
+        >>> grp = Group(groups)
+        >>> print(grp.get_groups_keys_list)
+        ['group1', 'group2', 'group3']
+        """
         return [gp for gp in sorted(self.data.keys())]