The rsa library, which is a requirement for the oauth2client dependency, dropped support for python 2 and 3.4 after version 4 (https://pypi.org/project/rsa/4.1.1/), breaking compatibility with those versions for projects that use this one as a dependency.
Ideally we'd add this change in oauth2client, but as it is now deprecated and read-only that is not possible.
The rsa library, which is a requirement for the oauth2client dependency, dropped support for python 2 and 3.4 after version 4 (https://pypi.org/project/rsa/4.1.1/), breaking compatibility with those versions for projects that use this one as a dependency.
Ideally we'd add this change in oauth2client, but as it is now deprecated and read-only that is not possible.