creating python package with multiple level of folders

Question

I would like to create a package of my python code. My folder structure is like below:

sing*(this is a folder)*
--ml*(this is a folder)*
----regression*(this is a folder)*
------linear.py*(this is a class file with functions in it)* 
----classification*(this is a folder)*
------logistic.py*(this is a class file with functions in it)*

i want to access class within linear.py by something like:

from sing.ml.regression import linear

Please advice how to create a package like this

thanks in advance

you already should be able to access to linear from where you are using absolute imports, I believe — Shinra tensei
– Shinra tensei, Commented Feb 28, 2018 at 9:11
@Shinratensei, are you saying that if i were to have a test.py file in "sing" folder then inside the test.py i can call linear.py class by saying "sing.ml.regression import linear" ? — Amit
– Amit, Commented Feb 28, 2018 at 9:18
from what I've read in other questions, yes, you should be able to — Shinra tensei
– Shinra tensei, Commented Feb 28, 2018 at 9:33
No i get the following error "ValueError: Attempted relative import in non-package" — Amit
– Amit, Commented Feb 28, 2018 at 9:38

Asit Rout · Accepted Answer · 2018-02-28 09:42:21Z

4

sing
    __init__.py
    -ml
        __init__.py
        -regression
           __init__.py
           linear.py

        -classification
           __init__.py
           logistic.py

And if the working directory of application is not parent folder of sing then you need to register folder 'sing' into PYTHONPATH environment variable.

For importing linear from sing folder you can use relative path:

from ml.regression import linear

and for calling function of linear file you can use:

linear.<*functionname*>(...)

answered Feb 28, 2018 at 9:42

Asit Rout

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2 Comments

Amit Over a year ago

error is "TypeError: 'module' object is not callable" and the code is import os os.chdir("/Users/Documents/sing"); from ml.regression import Linear obj=Linear()

Amit Over a year ago

even if i try "linear.<*functionname*>(...)" and get the same error

Giacomo Catenazzi · Accepted Answer · 2018-02-28 09:38:22Z

3

You need to add a __init__.py files in every folder, so that python interpret the other *.py files (and folder) as packages. A empty file is enough.

answered Feb 28, 2018 at 9:38

Giacomo Catenazzi

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