Why I couldn't find my module (alembic autogenerate)?

[junepeach]

I installed alembic tool in 3 of my computers. 2 of them finally worked fine, but this one doesn't work with the same configuration.

 

I tried both of below code in env.py:

1) import os, sys
sys.path.append(os.getcwd())
from dbmodule import SAINT8
target_metadata = SAINT8.Base.metadata

2)  I updated pythonpath for this one:
from dbmodule import SAINT8
target_metadata = SAINT8.Base.metadata

 

But I always got error , and really have no idea :(

Traceback (most recent call last):
  File "/usr/local/bin/alembic", line 9, in <module>
    load_entry_point('alembic==0.4.0', 'console_scripts', 'alembic')()
  File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 255, in                                main
    CommandLine(prog=prog).main(argv=argv)
  File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 250, in                                main
    self.run_cmd(cfg, options)
  File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 241, in                                run_cmd
    **dict((k, getattr(options, k)) for k in kwarg)
  File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 97, in                                revision
    script.run_env()
  File "/usr/local/lib/python2.7/dist-packages/alembic/script.py", line 191, in                                run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/local/lib/python2.7/dist-packages/alembic/util.py", line 185, in lo                               ad_python_file
    module = imp.load_source(module_id, path, open(path, 'rb'))
  File "alembic/env.py", line 18, in <module>
    from dbmodule import SAINT8
ImportError: No module named dbmodule

 

Thanks and best regards.