Cannot import modules without entering the interactive mode

I have an environment created with conda create -n bob3py35 python=3.5 bob-devel=2017.09.04 bob-extras=2017.10.03 and then I run buidlout in one of the packages. I have tested this with bob.learn.tensorflow and bob.dap.base. Buildout finishes fine but I cannot import the module with entering interactive mode:

$ git clean -ffdx
$ buildout
$ bin/python -c 'import bob.learn.tensorflow'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named 'bob.learn.tensorflow'
$ bin/python
Python 3.5.4 |Continuum Analytics, Inc.| (default, Aug 14 2017, 13:26:58) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import bob.learn.tensorflow
>>> # the import worked fine here.
$

I have no idea why am I getting this error. This does not happen with Python 2.7.