pytest and nosetest failing

(nuitka-venv) tab1tha@tab1tha-Lenovo-G50-80:~/virtualnuitka$ nosetests -v rsaUsing.py
Failure: ImportError (No module named rsa) ... ERROR

======================================================================
ERROR: Failure: ImportError (No module named rsa)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/lib/python2.7/dist-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/lib/python2.7/dist-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/home/tab1tha/virtualnuitka/rsaUsing.py", line 1, in <module>
    import rsa
ImportError: No module named rsa

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
(nuitka-venv) tab1tha@tab1tha-Lenovo-G50-80:~/virtualnuitka$