Recommending installation via sudo should not be done as use of virtualenv is preferred. Given the popularity of virtualenv for isolating dependencies (which is now also part of Python 3), it makes sense to only recommend installation with regular permissions, not sudo. This library should be installed as one of the other isolated dependencies of a project and as such it shouldn't be installed as a global dependency (only in rare cases).
As a command-line script I think it makes sense to install this system-wide. I do agree that sudo does not need to me in the README though. Merging now. Thanks!
Recommending installation via sudo should not be done as use of virtualenv is preferred. Given the popularity of virtualenv for isolating dependencies (which is now also part of Python 3), it makes sense to only recommend installation with regular permissions, not sudo. This library should be installed as one of the other isolated dependencies of a project and as such it shouldn't be installed as a global dependency (only in rare cases).