PyOP2 quick install instructions do not sort out imports

[dorugeber]

Leads to errors like

ImportError: No module named pyop2, yaml, ...

One solution would be to copy FEniCS's Dorsal by writing out a

add the following line to your .bashrc: source /blah/blah.conf

or

export PYTHONPATH=...

[kynan]

The YAML dependency was indeed missing. That's fixed by OP2/PyOP2#258

You shouldn't need to add PyOP2 to your PYTHONPATH, the python setup.py develop should take care of that.

[kynan]

Can anyone verify this? @funsim? @ctjacobs?

[ctjacobs]

I've just re-run the PyOP2 install.sh script on a fresh install of Ubuntu 12.04 (with sudo bash). The installation of all dependencies and the PyOP2 testing were successful. However, the same reported ImportErrors appeared when running the Firedrake tests:

• ImportError: No module named pyop2. Worked around using sudo python setup.py install from within the PyOP2 directory.
• ImportError: No module named yaml. Worked around using sudo apt-get install python-yaml, although the PyYAML package was already present in the .local directory:

christian@christian-VirtualBox:~/firedrake$ sudo -E pip install PyYAML Requirement already satisfied (use --upgrade to upgrade): PyYAML in /home/christian/.local/lib/python2.7/site-packages/PyYAML-3.10-py2.7-linux-i686.egg Cleaning up...

• ImportError: No module named cgen. Worked around using sudo -E pip install cgen.

[kynan]

@ctjacobs Any chance you could try again with fa12823? I think I should have fixed these issues (apart from cgen, which is not a PyOP2 dependency for the sequential backend).

[ctjacobs]

Thanks Florian. The pyop2 and yaml ImportErrors have now gone, but when I try "from firedrake import *" in IPython I still get the following message about cgen:

In [1]: from firedrake import *
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
/home/christian/firedrake/<ipython-input-1-379626444471> in <module>()
----> 1 from firedrake import *

/home/christian/firedrake/python/firedrake/__init__.py in <module>()
----> 1 from core_types import *
      2 from projection import *
      3 from ufl import *
      4 from ufl_expr import *
      5 from pyop2.logger import *

/home/christian/firedrake/core_types.pyx in init firedrake.core_types (firedrake/core_types.c:37460)()

/home/christian/firedrake/python/firedrake/assemble_expressions.py in <module>()
      4 from pyop2 import op2
      5 import core_types
----> 6 import cgen
      7
      8

ImportError: No module named cgen

[dham]

That's a problem in the Firedrake install instructions which I have just fixed. The changes are at:

http://www.firedrakeproject.org/download.html#firedrake

but for reference:

sudo pip install cgen

[ctjacobs]

Thanks David. I no longer get ImportErrors when importing firedrake.

[dham]

Can we close this issue now?

[kynan]

I think we can. Reopen if you find more issues.