Add docstring

cleanup.py

@@ -37,6 +37,13 @@ class WorkingDirectory(object):
 
 
 def module_path(module=__file__, parent=False):
+    """
+    Detect path for a module.
+
+    :param module: The module who's path is being detected.  Defaults to current module.
+    :param parent: True to return the parent folder of the current module.
+    :return: The absolute normalized path to the module or its parent.
+    """
     try:
         path = module.__file__
     except AttributeError:
@@ -122,6 +129,12 @@ def clean_folders(*paths):
 
 
 def force_clean_folder(path, required):
+    """
+    Force clean a folder and exclude any required subfolders.
+
+    :param path: Target folder to remove subfolders
+    :param required: Keep only the required subfolders
+    """
     root, dirs, files = next(os.walk(path))
     required = sorted(required)
     if required: