According to https://github.com/kennethreitz/requests/issues/749#issuecomment-19187417 there is no need to install pyasn1-modules.

8 년 전 · 0af50e8505
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,6 @@ flask-babel==0.11.1
 
				 lxml==3.7.1
			
 
				 ndg-httpsclient==0.4.2
			
 
				 pyasn1==0.1.9
			
 
				-pyasn1-modules==0.0.8
			
 
				 pygments==2.1.3
			
 
				 pyopenssl==16.2.0
			
 
				 python-dateutil==2.5.3