1

I have written a very simple module (test.f90)

module tt

implicit none
character(:),allocatable :: hh
contains
subroutine test()
    implicit none
    integer :: i
end subroutine
end module tt

I want now to wrap it into an object for Python using f2py.

I use the following commands:

gfortran-9 -c test.f90 -Wall
f2py -m g -c test.f90

But I obtain the following errors. These errors seems to be correlated with the allocatable string and I am currently not able to find a solution to remove it.

/var/folders/fg/53phbn8n6nd3vrhm3sh_36w40000gn/T/tmpjtueazku/src.macosx-10.7-x86_64-3.6/g-f2pywrappers2.f90:25:17:

   25 |        allocate(d(s(1)))
      |                 1
Error: Shape specification for allocatable scalar at (1)
/var/folders/fg/53phbn8n6nd3vrhm3sh_36w40000gn/T/tmpjtueazku/src.macosx-10.7-x86_64-3.6/g-f2pywrappers2.f90:16:22:

   16 |             if ((size(d,i).ne.s(i)).and.(s(i).ge.0)) then
      |                      1
Error: 'array' argument of 'size' intrinsic at (1) must be an array
/var/folders/fg/53phbn8n6nd3vrhm3sh_36w40000gn/T/tmpjtueazku/src.macosx-10.7-x86_64-3.6/g-f2pywrappers2.f90:29:24:

   29 |             s(i) = size(d,i)
      |                        1
Error: 'array' argument of 'size' intrinsic at (1) must be an array
Improve this question
5
  • The errors that you show have no relation to the Fortran code you posted. Try again? Commented Feb 9, 2020 at 23:29
  • 1
    The error is not directly due to the fortran code but it is due to the fortran code generated by f2py. Thus gfortran gives no error but f2py does. Commented Feb 10, 2020 at 6:59
  • 1
    The specification statement character(:),allocatable :: hh means that the array length is not yet defined. I don't know if f2py can manage allocatable character variables. Allocatable arrays of length 1 character variables chracter, allocatable :: hh(:) should work. For info, f2py Fortran understanding stop at Fortran 95. Commented Feb 10, 2020 at 9:28
  • @PierredeBuyl, character(:), allocatable :: hh is not an array, so your first sentence makes no sense. hh is a deferred-length scalar variable. Looks the f2py does not support this feature of Fortran or it is broken. Commented Feb 10, 2020 at 15:15
  • I mistyped, I meant length of character variable. f2py does support arrays of characters though. But not deferred length character variables (either as scalars or elements of an array). Commented Feb 10, 2020 at 16:26
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