I try to reproduce the "Analyzing the Parker Solar Probe flybys" example from the page https://docs.poliastro.space/en/latest/examples/Analyzing%20the%20Parker%20Solar%20Probe%20flybys.html,
but have no success. The call
v0, v1_pre = iod.lambert(Sun.k, r0, r1, tof.to(u.s))
(cell #17 in the link above) got the error "ValueError: not enough values to unpack (expected 2, got 1)".
I had tried option like the next
v0 = iod.lambert(Sun.k, r0, r1, tof.to(u.s))
v0. It got the message: "<generator object lambert at 0x000001BAE85380B0>".
I had tried iod.lambert, iod.izzo.lambert and iod.vallado.lambert. The last option got error "AttributeError: module 'poliastro.iod' has no attribute 'vallado' ".
Jupyter notebook and Python standalone script have the same behavior.
I had tried it with poliastro 0.14.0 and 0.16.3, I reboot Windows after poliastro 0.16.3 install, all with no success.
Python 3.8.2 64 bit.
What I do wrong?
Thanks in advance!