implemented get_acrticle_info() and get_download_url()

input/input_fj.py

 #!/usr/bin/env python3
 """
-Functions for information retrievel of articles from the ACS journal
+Functions for information retrievel of articles from the ACS journal JCIM
 
 """
 
@@ -16,6 +16,7 @@ __status__ = "Production"
 from bs4 import BeautifulSoup as bs
 import requests as req
 import sys
+from pathlib import Path
 
 class Publication:
     #_registry = []
@@ -53,11 +54,27 @@ def get_article_info():
     pub = Publication(article_title, publication_date, contributors, doi_url)
     return pub
 
-"""def get_citation_info(pub)
+def get_download_url():
+    export = soup.find('div', class_ = 'cit-download-dropdown_content')
+    url = 'https://pubs.acs.org'
+    for link in export.find_all('a'):
+        if link.get('title') == 'Citation and references':
+            url += link.get('href')     
+    return url
 
-    return pub
+def download(url): # Download citation and references file
+    if url.find('='):
+        filename = url.rsplit('=', 1)[1]
+    path = Path(('./files/' + filename))
+    if path.is_file():
+        print("File already exists")
+    else:
+        print("File does not exist")
+#def get_citation_info(pub)
+    
+#    return pub
 
-def input():"""
+#def input():
 
 if len(sys.argv) != 2:
     sys.stderr.write('Usage: {} <url>\n'.format(sys.argv[0]))
@@ -74,3 +91,6 @@ Contributors:''')
 print(*(pub.contributors), sep = ", ")
 print(f'''
 DOI-URL: {pub.doi_url}''')
+
+url = get_download_url()
+download(url)