diff --git a/exampleProg.py b/exampleProg.py
index 2bd56d3..a03d25d 100644
--- a/exampleProg.py
+++ b/exampleProg.py
@@ -1,106 +1,113 @@
-"""An example program that uses the elsapy module"""
-
-from elsapy.elsclient import ElsClient
-from elsapy.elsprofile import ElsAuthor, ElsAffil
-from elsapy.elsdoc import FullDoc, AbsDoc
-from elsapy.elssearch import ElsSearch
-import json
-    
-## Load configuration
-con_file = open("config.json")
-config = json.load(con_file)
-con_file.close()
-
-## Initialize client
-client = ElsClient(config['apikey'])
-client.inst_token = config['insttoken']
-
-## Author example
-# Initialize author with uri
-my_auth = ElsAuthor(
-        uri = 'https://api.elsevier.com/content/author/author_id/7004367821')
-# Read author data, then write to disk
-if my_auth.read(client):
-    print ("my_auth.full_name: ", my_auth.full_name)
-    my_auth.write()
-else:
-    print ("Read author failed.")
-
-## Affiliation example
-# Initialize affiliation with ID as string
-my_aff = ElsAffil(affil_id = '60101411')
-if my_aff.read(client):
-    print ("my_aff.name: ", my_aff.name)
-    my_aff.write()
-else:
-    print ("Read affiliation failed.")
-
-## Scopus (Abtract) document example
-# Initialize document with ID as integer
-scp_doc = AbsDoc(scp_id = 84872135457)
-if scp_doc.read(client):
-    print ("scp_doc.title: ", scp_doc.title)
-    scp_doc.write()   
-else:
-    print ("Read document failed.")
-
-## ScienceDirect (full-text) document example using PII
-pii_doc = FullDoc(sd_pii = 'S1674927814000082')
-if pii_doc.read(client):
-    print ("pii_doc.title: ", pii_doc.title)
-    pii_doc.write()   
-else:
-    print ("Read document failed.")
-
-## ScienceDirect (full-text) document example using DOI
-doi_doc = FullDoc(doi = '10.1016/S1525-1578(10)60571-5')
-if doi_doc.read(client):
-    print ("doi_doc.title: ", doi_doc.title)
-    doi_doc.write()   
-else:
-    print ("Read document failed.")
-
-
-## Load list of documents from the API into affilation and author objects.
-# Since a document list is retrieved for 25 entries at a time, this is
-#  a potentially lenghty operation - hence the prompt.
-print ("Load documents (Y/N)?")
-s = input('--> ')
-
-if (s == "y" or s == "Y"):
-
-    ## Read all documents for example author, then write to disk
-    if my_auth.read_docs(client):
-        print ("my_auth.doc_list has " + str(len(my_auth.doc_list)) + " items.")
-        my_auth.write_docs()
-    else:
-        print ("Read docs for author failed.")
-
-    ## Read all documents for example affiliation, then write to disk
-    if my_aff.read_docs(client):
-        print ("my_aff.doc_list has " + str(len(my_aff.doc_list)) + " items.")
-        my_aff.write_docs()
-    else:
-        print ("Read docs for affiliation failed.")
-
-## Initialize author search object and execute search
-auth_srch = ElsSearch('authlast(keuskamp)','author')
-auth_srch.execute(client)
-print ("auth_srch has", len(auth_srch.results), "results.")
-
-## Initialize affiliation search object and execute search
-aff_srch = ElsSearch('affil(amsterdam)','affiliation')
-aff_srch.execute(client)
-print ("aff_srch has", len(aff_srch.results), "results.")
-
-## Initialize doc search object using Scopus and execute search, retrieving 
-#   all results
-doc_srch = ElsSearch("AFFIL(dartmouth) AND AUTHOR-NAME(lewis) AND PUBYEAR > 2011",'scopus')
-doc_srch.execute(client, get_all = True)
-print ("doc_srch has", len(doc_srch.results), "results.")
-
-## Initialize doc search object using ScienceDirect and execute search, 
-#   retrieving all results
-doc_srch = ElsSearch("star trek vs star wars",'sciencedirect')
-doc_srch.execute(client, get_all = False)
-print ("doc_srch has", len(doc_srch.results), "results.")
\ No newline at end of file
+"""An example program that uses the elsapy module"""
+
+import json
+
+from elsapy.elsclient import ElsClient
+from elsapy.elsdoc import AbsDoc, FullDoc
+from elsapy.elsprofile import ElsAffil, ElsAuthor
+from elsapy.elssearch import ElsSearch
+
+## Load configuration
+con_file = open("config.json")
+config = json.load(con_file)
+con_file.close()
+
+## Initialize client
+client = ElsClient(config['apikey'])
+try:
+    # If you don't have a valid insttoken (which you would have received from
+    # Elsevier support staff), delete the placeholder text. If you enter a
+    # dummy value, your API requests will fail.
+    client.inst_token = config['insttoken']
+except KeyError:
+    pass
+
+## Author example
+# Initialize author with uri
+my_auth = ElsAuthor(
+        uri='https://api.elsevier.com/content/author/author_id/7004367821')
+# Read author data, then write to disk
+if my_auth.read(client):
+    print("my_auth.full_name: ", my_auth.full_name)
+    my_auth.write()
+else:
+    print("Read author failed.")
+
+## Affiliation example
+# Initialize affiliation with ID as string
+my_aff = ElsAffil(affil_id='60101411')
+if my_aff.read(client):
+    print("my_aff.name: ", my_aff.name)
+    my_aff.write()
+else:
+    print("Read affiliation failed.")
+
+## Scopus (Abtract) document example
+# Initialize document with ID as integer
+scp_doc = AbsDoc(scp_id=84872135457)
+if scp_doc.read(client):
+    print("scp_doc.title: ", scp_doc.title)
+    scp_doc.write()
+else:
+    print("Read document failed.")
+
+## ScienceDirect (full-text) document example using PII
+pii_doc = FullDoc(sd_pii='S1674927814000082')
+if pii_doc.read(client):
+    print("pii_doc.title: ", pii_doc.title)
+    pii_doc.write()
+else:
+    print("Read document failed.")
+
+## ScienceDirect (full-text) document example using DOI
+doi_doc = FullDoc(doi='10.1016/S1525-1578(10)60571-5')
+if doi_doc.read(client):
+    print("doi_doc.title: ", doi_doc.title)
+    doi_doc.write()
+else:
+    print("Read document failed.")
+
+## Load list of documents from the API into affilation and author objects.
+# Since a document list is retrieved for 25 entries at a time, this is
+#  a potentially lenghty operation - hence the prompt.
+print("Load documents (Y/N)?")
+s = input('--> ')
+
+if (s == "y" or s == "Y"):
+
+    ## Read all documents for example author, then write to disk
+    if my_auth.read_docs(client):
+        print("my_auth.doc_list has " + str(len(my_auth.doc_list)) + " items.")
+        my_auth.write_docs()
+    else:
+        print("Read docs for author failed.")
+
+    ## Read all documents for example affiliation, then write to disk
+    if my_aff.read_docs(client):
+        print("my_aff.doc_list has " + str(len(my_aff.doc_list)) + " items.")
+        my_aff.write_docs()
+    else:
+        print("Read docs for affiliation failed.")
+
+## Initialize author search object and execute search
+auth_srch = ElsSearch('authlast(keuskamp)', 'author')
+auth_srch.execute(client)
+print("auth_srch has", len(auth_srch.results), "results.")
+
+## Initialize affiliation search object and execute search
+aff_srch = ElsSearch('affil(amsterdam)', 'affiliation')
+aff_srch.execute(client)
+print("aff_srch has", len(aff_srch.results), "results.")
+
+## Initialize doc search object using Scopus and execute search, retrieving 
+#   all results
+doc_srch = ElsSearch(
+    "AFFIL(dartmouth) AND AUTHOR-NAME(lewis) AND PUBYEAR > 2011", 'scopus')
+doc_srch.execute(client, get_all=True)
+print("doc_srch has", len(doc_srch.results), "results.")
+
+## Initialize doc search object using ScienceDirect and execute search, 
+#   retrieving all results
+doc_srch = ElsSearch("star trek vs star wars", 'sciencedirect')
+doc_srch.execute(client, get_all=False)
+print("doc_srch has", len(doc_srch.results), "results.")