Prevent duplicate authors

Some INP contain duplicate author names like this:
Author,Name:Author,Name

diff --git a/m_librarian/inp.py b/m_librarian/inp.py
index 56f85e4d1dcdfb4561fe0ac08cc4d364c291f25a..09cd42be2151a5e7b11dda19673cbada15578721 100644 (file)
--- a/m_librarian/inp.py
+++ b/m_librarian/inp.py
@@ -45,8 +45,13 @@ def import_inp_line(archive, parts):
                 lib_id=lib_id, deleted=deleted,
                 extension=extension_row, date=date,
                 language=language_row)
-    for author in authors.split(':'):
+    authors = authors.split(':')
+    seen_authors = set()
+    for author in authors:
         if author:
+            if author in seen_authors:
+                continue
+            seen_authors.add(author)
             alist = author.split(',', 2)
             surname = alist[0]
             if len(alist) > 1: