title: Xlwings won't close book after saving
body: <p>I am currently trying to use xlwings to open a book and update it's links, then save and close. The relevant code I am using is:</p>
  
  <pre><code>import os
  import xlwings as xw
  
  app=xw.App(add_book=False)
  app.display_alerts=False
  
  for file in os.scandir(dirname):
           if (file.name.endswith("Unposted Summary.xlsm")):
                  path=file.path
                  tmp=app.books.api.Open(path,UpdateLinks=True)
                  tmp.save(path)
                  app.quit()
  </code></pre>
  
  <p>After having read the documentation several times and using several different methods such as app.quit(), app.kill(), book.close(), etc... I have been unable to get xlwings to close the current book after saving it, so I haven't even approached the question of whether the links are updating properly or not.</p>
  
  <p>I'm guessing the problem is coming from how I'm opening the books. If so, I don't know the syntax to close them.</p>