diff --git a/newspaper/images.py b/newspaper/images.py
index 54e5b1e1..4ee67d39 100644
--- a/newspaper/images.py
+++ b/newspaper/images.py
@@ -12,7 +12,6 @@
 import math
 import io
 import traceback
-import urllib.request
 import urllib.parse
 import urllib.error
 
@@ -86,6 +85,7 @@ def clean_url(url):
 
 
 def fetch_url(url, useragent, referer=None, retries=1, dimension=False):
+    import urllib.request
     cur_try = 0
     nothing = None if dimension else (None, None)
     url = clean_url(url)
diff --git a/newspaper/utils.py b/newspaper/utils.py
index 86f299cf..6033af19 100644
--- a/newspaper/utils.py
+++ b/newspaper/utils.py
@@ -268,7 +268,7 @@ def memoize_articles(source, articles):
         return []
 
     memo = {}
-    cur_articles = {article.url: article for article in articles}
+    cur_articles = dict([(article.url, article) for article in articles])
     d_pth = os.path.join(settings.MEMO_DIR, domain_to_filename(source_domain))
 
     if os.path.exists(d_pth):