title: How to Count number of pages of an online pdf in python?
body: <p>I am analyzing NLP conferences. I need to extract number of pages from pdfs which are hosted online, using python. 
  For example :
               The source of the pdf is "<a href="https://www.aclweb.org/anthology/E91-1002.pdf" rel="nofollow noreferrer">https://www.aclweb.org/anthology/E91-1002.pdf</a>"
               The output should be 6.</p>