Updated doc strings

osxphotos/_constants.py

@@ -1,3 +1,7 @@
+"""
+Constants used by osxphotos 
+"""
+
 # which Photos library database versions have been tested
 # Photos 2.0 (10.12.6) == 2622
 # Photos 3.0 (10.13.6) == 3301

osxphotos/photoinfo.py

@@ -1,3 +1,9 @@
+"""
+PhotoInfo class
+Represents a single photo in the Photos library and provides access to the photo's attributes
+PhotosDB.photos() returns a list of PhotoInfo objects
+"""
+
 import json
 import logging
 import os.path

osxphotos/photosdb.py

@@ -1,3 +1,8 @@
+"""
+PhotosDB class
+Processes a Photos.app library database to extract information about photos
+"""
+
 import logging
 import os.path
 import pathlib