cora.zip download failed. What should I do? 
What’s the error message and which version of dgl are you using?
error message：
File “C:\Users\Anaconda3\envs\dgl\lib\site-packages\dgl\data\utils.py”, line 145, in download
r = requests.get(url, stream=True, verify=verify_ssl)
AttributeError: type object ‘requests_failed_to_import’ has no attribute ‘get’
version of dgl：0.4.1
I just run the code of gcn.py in your Docs.
Could you try pip install requests?
Thank you~ The problem has been solved with your method.