sep defaults to None to handle mutlitple spaces

advertools/ad_from_string.py

@@ -1,5 +1,5 @@
 import string
-def ad_from_string(s, slots=(30, 30, 80, 15, 15), sep=' ', capitalize=False):
+def ad_from_string(s, slots=(30, 30, 80, 15, 15), sep=None, capitalize=False):
     """Convert string `s` to an ad by splitting it into groups of words.
     Each group would have a length of at most the allowed length for that slot. 
     
@@ -35,11 +35,11 @@ def ad_from_string(s, slots=(30, 30, 80, 15, 15), sep=' ', capitalize=False):
 
     for i, slot in enumerate(slots):
         while counter <= len(str_words) - 1:
-            if len(text_ad[i] + str_words[counter]) >= slot:
+            if len(text_ad[i] + str_words[counter]) > slot:
                 break
             text_ad[i] += ' ' + str_words[counter] if text_ad[i] else str_words[counter]
             counter += 1
-
-    text_ad[-1] = sep.join(str_words[counter:])
+                  
+    text_ad[-1] = sep.join(str_words[counter:]) if sep is not None else ' '.join(str_words[counter:]) 
 
     return [string.capwords(x) if capitalize else x for x in text_ad]