How to Use f2py module in python

Question

Just having a bit of trouble with using f2py. I have compiled to following code into a .so file just fine, and it imports into my python code just fine, but I am just wondering how do I then use it. I know there is a command doc but it jus says that this module has no attribute called "doc"

Fortran Code:

subroutine Test
implicit none
real, dimension(3600000) :: Alpha,Sigma
open(10, file='Alpha.txt')
read(10, *) Alpha
Sigma = (87.6*2)/((87.6*(sin(Alpha))**2)+(2*cos(Alpha)**2))
end subroutine

Python Code:

import matplotlib.pyplot as plt 
import numpy as np 
import Sigma

print(Sigma._doc_)

Error:

File "/home/tom/Desktop/f2py/Plot.py", line 5, in <module>
    print(Sigma._doc_)
AttributeError: 'module' object has no attribute '_doc_'

Do I have to somehow enter the doc attribute into the original fortran code? If so how would I go about that?

What do you want to do with the doc? Why do you think there should be any doc present? Were you able to run the test subroutine? — Vladimir F Героям слава
– Vladimir F Героям слава, Commented Feb 28, 2018 at 21:19
You have to use the doc to find out how the functions are stored — Tom Heeley
– Tom Heeley, Commented Feb 28, 2018 at 22:10

Timothy Brown · Accepted Answer · 2018-02-28 22:30:53Z

1

According to their example, it looks like you need to call the print on module.subroutine.__doc__.

If I save your file to test1.f90, then compile it

f2py -c test1.f90 -m test1

And then query the doc string.

~$ python
Python 3.6.4 (default, Jan  5 2018, 02:35:40) 
[GCC 7.2.1 20171224] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import test1
>>> print(test1.test.__doc__)
test()

Wrapper for ``test``.


>>>

Which looks fine to me since you have no arguments going to Test.

answered Feb 28, 2018 at 22:30

Timothy Brown

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