fortran subroutine import in python fails

Question

I am trying to import a fortran subroutine into python code. Following this guide https://notmatthancock.github.io/2017/02/10/calling-fortran-from-python.html I have added the following line into my fortran code:

!f2py intent(in) :: ear,ne,parames,ifl
!f2py intent(out) photar,photer

However when I try to use f2py -c fireball_ES_param.f -m fireball to create fireball.so to import in my python code I get several hundreds of warnings, which might be the problem but I am not sure: https://www.4shared.com/s/f2ynHZ_Wjda (it's too long to be posted here).

In any case, the fireball.cpython-34m.so file gets created, but when I try to import that from python I get:

$ python

Python 2.7.6 (default, Nov 13 2018, 12:45:42)  [GCC 4.8.4] on
linux2 Type "help", "copyright", "credits" or "license" for more
information.
>>> import fireball Traceback (most recent call last):
File "<stdin>", line 1, in <module> ImportError:
  No module named fireball

I tried:

import sys

sys.path.append('/path/to/folder/containing/fireball.cpython-34m.so')

but got the same result. I am not sure if there is a problem with the creation of fireball.so, or with its import.

First comment: f2py uses Python 3.4 (as can be seen from the filename of the module) while you try tro import it in Python 2.7 — Pierre de Buyl
– Pierre de Buyl, Commented May 31, 2019 at 10:06
One solution: import the code in Python 3.4 instead of Python 2.7. Other solution: see if you have f2py also for Python 2.7 — Pierre de Buyl
– Pierre de Buyl, Commented May 31, 2019 at 10:06
in the same folder where I start python, I also manually include the folder into the paths searched by python with sys.path.append('/path/to/folder/containing/fireball.cpython-34m.so'), but nothing changes — J. Dowe
– J. Dowe, Commented May 31, 2019 at 14:48

Pierre de Buyl · Accepted Answer · 2019-06-04 07:30:41Z

1

f2py links to Python 3.4 (hence the 34 in fireball.cpython-34m.so) but python3 is actually version 3.6 (see you last comment).

Your options:

Start your program with Python 3.4 which should be available as python3.4
Update f2py to Python 3.6. If you installed via pip, pip install --user -U numpy should do. Then rebuild the extension.

answered Jun 4, 2019 at 7:30

Pierre de Buyl

7,3232 gold badges18 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

fortran subroutine import in python fails

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related