Add len function to notification expressions

plexpy/helpers.py

@@ -537,6 +537,13 @@ def helper_divmod(a, b):
         return 0
 
 
+def helper_len(s):
+    try:
+        return len(s)
+    except (ValueError, TypeError):
+        return 0
+
+
 def helper_round(n, ndigits=None):
     try:
         return round(n, ndigits)

plexpy/notification_handler.py

@@ -1825,6 +1825,7 @@ def str_eval(field_name, kwargs):
         'divmod': helpers.helper_divmod,
         'float': helpers.cast_to_float,
         'int': helpers.cast_to_int,
+        'len': helpers.helper_len,
         'round': helpers.helper_round,
         'str': str
     }