Creating an environment with pyvenv or "python -m venv" in 3.4+ can be a bit disconcerting, as it may take some time (especially on older machines).

It would be good if the command line utility displayed some kind of marking while this operation was in progress.

(The delay seems to be mostly due to ensurepip - running "./python -m venv --without-pip" under my 3.4 checkout is relatively fast, at least on my system)