Use str.find(), not str.index() in each_message

lib/nntp/tiny/message.py

@@ -26,19 +26,19 @@ def each_line(text: str):
     end   = len(text)
 
     while True:
-        try:
-            index = text.index('\n', start, end)
+        index = text.find('\n', start, end)
 
-            yield text[start:index+1]
-
-            start = index + 1
-
-            if start == end:
-                break
-        except ValueError:
+        if index < 0:
             yield text[start:end]
             break
 
+        yield text[start:index+1]
+
+        start = index + 1
+
+        if start == end:
+            break
+
 def parse_timestamp(timestamp: str):
     if timestamp is None or timestamp == '':
         return datetime.datetime.fromtimestamp(0)