AttributeError: 'Orbit' object has no attribute 'frame'

[iamabhishek0]

>>> from poliastro import *
>>> r = [-6045, -3490, 2500] * u.km
>>> v = [-3.457, 6.618, 2.533] * u.km / u.s
>>> ss = Orbit.from_vectors(Earth, r, v)
>>> ss
7283 x 10293 km x 153.2 deg (GCRS) orbit around Earth (♁) at epoch J2000.000 (TT)
>>> ss.frame
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Orbit' object has no attribute 'frame'

[astrojuanlu]

Hi @iamabhishek0, I tried this with master and everything worked:

>>> from astropy import units as u
>>> r = [-6045, -3490, 2500] * u.km
>>> v = [-3.457, 6.618, 2.533] * u.km / u.s
>>> from poliastro.twobody import Orbit
>>> from poliastro.bodies import Earth
>>> ss = Orbit.from_vectors(Earth, r, v)
>>> ss.frame
<GCRS Frame (obstime=J2000.000, obsgeoloc=(0., 0., 0.) m, obsgeovel=(0., 0., 0.) m / s)>

could you please tell us what poliastro version are you using?

[iamabhishek0]

I am using the current version which is on the master.

[astrojuanlu]

I am not at all sure. Are you using Linux? Could you please paste the output of

$ which python
$ python -m pip list | grep poliastro
$ python -c "from poliastro.examples import iss; print(iss.frame)"

?

[iamabhishek0]

Yes, I am using Linux.

(polienv) [uchiha@pop-os src{master}]$ which python
/home/uchiha/Desktop/poliastro/polienv/bin/python
(polienv) [uchiha@pop-os src{master}]$ python -m pip list | grep poliastro
(polienv) [uchiha@pop-os src{master}]$ python -c "from poliastro.examples import iss; print(iss.frame)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'Orbit' object has no attribute 'frame'

[astrojuanlu]

Well, python -m pip list doesn't find it, so I wonder where is it finding it.

Can you do this?

$ python -c "import poliastro as p; print(p.__file__)"
$ python -c "import poliastro as p; print(p.__version__)"

[iamabhishek0]

(polienv) [uchiha@pop-os src{master}]$ python -c "import poliastro as p; print(p.__file__)"
/home/uchiha/Desktop/poliastro/src/poliastro/__init__.py
(polienv) [uchiha@pop-os src{master}]$ python -c "import poliastro as p; print(p.__version__)"
0.14.post0.dev0

[astrojuanlu]

Okay, so you're running the code inside src/poliastro. You won't need to do that if you flit install --symlink where pyproject.toml is, but let's not get there yet.

Last thing: do git status, since unfortunately the __version__ does not record the commit...

[iamabhishek0]

(polienv) [uchiha@pop-os src{master}]$ git status
On branch master
Your branch is up to date with 'origin/master'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)

        ../polienv/

nothing added to commit but untracked files present (use "git add" to track)

[astrojuanlu]

Sorry, I forgot the most important one 🤦‍♂️ git show

[iamabhishek0]

(polienv) [uchiha@pop-os src{master}]$ git show
commit 9994fd6a8e939ac74e0385232b689c46aa59a906 (HEAD -> master, origin/master, origin/HEAD)
Merge: 77b2f9f 5224680
Author: Juan Luis Cano Rodríguez <hello@juanlu.space>
Date:   Tue Mar 3 17:01:49 2020 +0100

    Merge pull request #853 from iamabhishek0/fixes_#852
    
    Fixed Broken benchmarks Link

[iamabhishek0]

Actually when I was setting up my virtual environment I did pip install .
But then I had to work on python 3.7.4 which was giving segmentation fault because of numba's bug.
So I created virtual environment using python3 -m virtualenv polienv and installed all the dependencies manually after which everything was working fine.
Sorry for installing the dependencies this way because I wasn't aware of flit install --symlink, I will give it a try today.

[astrojuanlu]

All right, sorry for the loooooooooong delay. I reproduced the "issue", now let me remember if it's actually a bug or a feature.