Python "src" layout not working correctly with pyproject-build-system

[Reza Housseini <reza.housseini@gmail.com>]

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Hi list

I'm packaging a project with pyproject-build-system which follows the 
src layout in python:

(define-public python-cfd-qsense
   (package
     (name "python-cfd-qsense")
     (version "d02178fc02cfef00d7fa0584d552614e9bdf4c5e")
     (source (origin
	      (method git-fetch)
	      (uri (git-reference
		    (url "https://gitlab.com/hsr-iet/wabesense/cfd_qsense.git")
		    (commit version)))
	      (file-name (git-file-name name version))
	      (sha256
	       (base32
		"1ys5my2kfsr5w94k619qrdjm5wa7j45z11dw2ib2ha0wpc85aw4x"))))
     (build-system pyproject-build-system)
     (arguments
      `(#:tests? #f ;; error in test suite
        #:phases
        (modify-phases %standard-phases
	 (replace 'check
	   (lambda* (#:key tests? #:allow-other-keys)
	     (when tests?
	       (invoke "python" "-m" "unittest")))))))
     (propagated-inputs (list
			python-numpy
			python-scipy
			python-matplotlib
			python-pyaml
			python-pandas
			python-numpy-stl
			python-coolprop))
     (home-page "https://gitlab.com/hsr-iet/wabesense/cfd_qsense")
     (synopsis
      "CFD simulation tool to produce pressure-discharge curve for water 
spring taps.")
     (description
      "CFD simulation tool to produce pressure-discharge curve for water 
spring taps.")
     (license license:gpl3)))

When inheriting from this package like so:

(package
   (inherit python-cfd-qsense)
   (source (local-file %source-dir #:recursive? #t)))))

it is no longer importable as module cfd_qsense instead I have to import 
src.cfd_qsense. Why is this behavior, when using the package as is 
everything works fine.

Thanks for any help.

Cheers,

-- 
Reza Housseini

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