OSX: nimble test fails: Importing the multiarray numpy extension module failed; caused by missing pyInitLibPath

[timotheecour]

I'm on OSX.

Testing Python executable: python2
Testing Python executable: python3
Testing Python executable: python2
Traceback (most recent call last):
  File "tests/tnimfrompy.py", line 128, in <module>
    s.testPyFromNim()
nimpy.Exception: Unexpected error encountered: <type 'exceptions.ImportError'>:
Importing the multiarray numpy extension module failed.  Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control).  Otherwise reinstall numpy.

Original error was: cannot import name multiarray

stack trace: (most recent call last)
/private/var/folders/ll/dtd6ksrn50n3xkdy4y61tf_80000gn/T/nimblecache/nimscriptapi.nim(165, 16)
/Users/timothee/git_clone/nim/nimpy/nimpy_43710.nims(88, 11) testTask
/Users/timothee/git_clone/nim/nimpy/nimpy_43710.nims(78, 14) runTests
/Users/timothee/git_clone/nim/Nim_devel/lib/system/nimscript.nim(260, 7) exec
/Users/timothee/git_clone/nim/Nim_devel/lib/system/nimscript.nim(260, 7) Error: unhandled exception: FAILED: python2 tests/tnimfrompy.py [OSError]
??? compiler msg initiated here [MsgOrigin]
       Tip: 1 messages have been suppressed, use --verbose to show them.
     Error: Exception raised during nimble script execution

note

• also fails with similar error with:NIMPY_PY_EXES=python3 nimble test
• adding

# in nimpy/tests/tpyfromnim.nim
import timn/nimpy_utils
initNimpy()

with:

# in timn/nimpy_utils
proc initNimpy*() =
  var isInit{.threadvar.}: bool
  if not isInit:
    # defined via https://github.com/yglukhov/nimpy/issues/171
    let libpython = findLibpython("python3")
    # dbg libpython
    pyInitLibPath(libpython)
    isInit = true

and then NIMPY_PY_EXES=python3 nimble test
makes it work

so we really need to add auto-discovery (calling pyInitLibPath), ie address #171

note 2

NIMPY_PY_EXES=python2 nimble test (or nimble test) still don't work, for other reasons:

Testing Python executable: python2
Testing Python executable: python2
Traceback (most recent call last):
  File "tests/tnimfrompy.py", line 2, in <module>
    import nimfrompy as s
TypeError: PyModule_AddObject() needs module as first arg

but that's a lesser problem given deprecation of python2

note 3

after that, CI should add OSX (currenly it's linux only AFAIK)