unable to import file in a python package

Question

I am trying to create a python package but I am having issues with imports. This is the current situation:

[lpuggini@machinelearn-1 src]$ source ~/VirtualEnvs/time_series_algorithms_venv/bin/activate
(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ tree                   
.
|-- TimeSeriesAlgorithms.egg-info
|   |-- PKG-INFO
|   |-- SOURCES.txt
|   |-- dependency_links.txt
|   `-- top_level.txt
|-- requirements.txt
|-- setup.py
`-- time_series_algorithms
    |-- __init__.py
    |-- __init__.pyc
    |-- examples
    |   |-- example_percentage_variation.py
    |   `-- example_percentage_variation.py~
    |-- percentage_varation.py
    `-- percentage_varation.pyc

3 directories, 12 files
(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ python setup.py develop
/home/lpuggini/VirtualEnvs/time_series_algorithms_venv/lib/python2.7/site-packages/setuptools/dist.py:475: UserWarning: Normalizing '0.1dev' to '0.1.dev0'
  normalized_version,
running develop
running egg_info
writing TimeSeriesAlgorithms.egg-info/PKG-INFO
writing top-level names to TimeSeriesAlgorithms.egg-info/top_level.txt
writing dependency_links to TimeSeriesAlgorithms.egg-info/dependency_links.txt
reading manifest file 'TimeSeriesAlgorithms.egg-info/SOURCES.txt'
writing manifest file 'TimeSeriesAlgorithms.egg-info/SOURCES.txt'
running build_ext
Creating /home/lpuggini/VirtualEnvs/time_series_algorithms_venv/lib/python2.7/site-packages/TimeSeriesAlgorithms.egg-link (link to .)
TimeSeriesAlgorithms 0.1.dev0 is already the active version in easy-install.pth

Installed /home/lpuggini/mlp/time_series_algorithms/trunk/src
Processing dependencies for TimeSeriesAlgorithms==0.1.dev0
Finished processing dependencies for TimeSeriesAlgorithms==0.1.dev0

and then when I try to run some code I get the following error:

(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ python time_series_algorithms/examples/example_percentage_variation.py
Traceback (most recent call last):
  File "time_series_algorithms/examples/example_percentage_variation.py", line 2, in <module>
    from time_series_algorithms.percentage_variation import PercentageVariationAD, PercentageVariationADConfig
ImportError: No module named percentage_variation
(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ 

This is my setup.py file

(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ cat setup.py 

from setuptools import setup, find_packages

setup(
    name='TimeSeriesAlgorithms',
    version='0.1dev',
    packages=find_packages(),
)
(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ 

I do not know why this import is failing. I am using python 2.7

NOTE:

I am able to import the module but not the python file:

(time_series_algorithms_venv) [lpuggini@machinelearn-1 ~]$ python
Python 2.7.5 (default, Oct 30 2018, 23:45:53) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import time_series_algorithms
>>> from time_series_algorithms import percentage_variation
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name percentage_variation
>>> 
[

ANSWER TO THE COMMENTS 1: Also the option suggested in the comments fails

(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ python time_series_algorithms/examples/example_percentage_variation.py
Traceback (most recent call last):
  File "time_series_algorithms/examples/example_percentage_variation.py", line 2, in <module>
    from TimeSeriesAlgorithms.time_series_algorithms.percentage_variation import PercentageVariationAD, PercentageVariationADConfig
ImportError: No module named TimeSeriesAlgorithms.time_series_algorithms.percentage_variation
(time_series_algorithms_venv) [lpuggini@machinelearn-1 src]$ 

Answer 1

This is a simple typo in the name of the file that the OP has:

The file is called:

time_series_algorithms/percentage_varation.py

and the import statement is:

from time_series_algorithms.percentage_variation import PercentageVariationAD, PercentageVariationADConfig

so the file is varation and the import is variation.

This would have probably been observable in an IDE, or an strace of the python script itself would have revealed it being unable to open the percentage_variation.py file even though it looks to be there.