great to see that you are using the Extract API.
The link you provided above links to the "Tableau SDK" documentation page, which is by now deprecated. You can find all documentation for the latest version of the Extract API 2.0 here.
I have the same problem with it. Can you try the 2019.1.0 version of the API?
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Hey Jayaram, I have the same problem when downloading the 2019.1.2 version (the one you can get over the link). However, with the 2019.1.0 version, it works for me.
I tested it again, and it works. Can you try to execute the following commands:
curl https://downloads.tableau.com/tssoftware/extractapi-py-osx64-2019-1-0.tar.gz -o 2019-1-0.tar.gz
tar -xzf 2019-1-0.tar.gz
sudo python setup.py install
python tableauSDKSample.py -b
this worked for me.