python 3.x - Import Error: No module name -

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i facing issue while importing class. folder structure below:

python_space   |_ __init__.py   |_ ds_tut      |_ __init__.py      |_ stacks         |_ __init__.py         |_ stacks.py  (contains class stack)      |_ trees         |_ __init__.py         |_ parsetree.py (wants import stack class above)

used following code import:

from stacks.stacks import stack

getting following error:

"importerror: no module named stacks.stacks"

stacks inside ds_tut module. work?

from ds_tut.stacks.stacks import stack

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