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ValueError: Attempted relative import in non-package - Printable Version

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ValueError: Attempted relative import in non-package - JoeB - Mar-08-2018

There are answers here: https://stackoverflow.com/questions/11536764/how-to-fix-attempted-relative-import-in-non-package-even-with-init-py but I don't really understand them.

My directory structure is as follows:

Output:
dir1/
    __init__.py
    model_helpers.py
    quantity_pred_pickle.py
    quantity_pred.py 
    tfidftransformer.py
Inside quantity_pred_pickle.py I have the following:

import quantity_pred
import tfidf_transformer
import model_helpers
quantity_pred and tfidf_transformer are imported without any problems, but when importing model_helpers I get the following error:

Output:
MacBook-Air:ff_nlp_trained_models Olly$ python quantity_pred_pickle.py 
Traceback (most recent call last):
  File "quantity_pred_pickle.py", line 14, in <module>
    from model_helpers import train_clf
  File "/Users/Olly/Documents/MSc/Natural Language Processing/Dissertation/dir1/model_helpers.py", line 14, in <module>
    from .tfidftransformer import TfIdfTransformer
ValueError: Attempted relative import in non-package
How can I solve this? Why is it occurring? Thanks.
SOLVED

RE: ValueError: Attempted relative import in non-package - Gribouillis - Mar-08-2018

You can perhaps remove the dot in from .tfidftransformer import TfIdfTransformer