Originally Posted by kovidgoyal
If you are trying to change only the title why dont you use set_title instead of set_metadata?
I'm trying to change some metadata, not only the title. I'm talking about the title as example, but I'm importing some metadata from a file, son I need to change sometimes only titles, but sometimes all or parts of metadata (title, authors, series, pubdate, etc).
And I don't understand why metadata fields are not changed when capital chars at the strings are changed.