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Import module from a different subdirectory

On Sat, 18 May 2019, dieter wrote:

> Test this by looking at "sys.path" instead:
>>>> import sys
>>>> sys.path
> It is "sys.path" which actually controls the import machinery.


Thank you. I missed this when researching PYTHONPATH. Here's what I get:

>>> sys.path
['', '/home/rshepard/development/bustrac', '/usr/lib/python37.zip',
'/usr/lib/python3.7', '/usr/lib/python3.7/lib-dynload',

All directories are present, and the one for the current project is the
first one searched.

> "sys.path" is typically a sequence of folders. Python's import machinery
> will look in those folders for modules/paackages for its (absolute)
> imports. Thus, if you use "import XXXX" or "from XXXX import ...", then
> one of those folders should contain a module or package named "XXXX".

I understand this. Within ~/development/bustrac as the CWD when I invoke the
test application with the first line:

from classes import model as m

I still see this result:

$ python3 test_act_de.py 
Traceback (most recent call last):
   File "test_act_de.py", line 1, in <module>
     from classes import model as m
ModuleNotFoundError: No module named 'classes'

'classes' is a package (a subdirectory) containing an empty __init__.py, not
a module. 'classes' conains a single module, model.py.

Since the project's root directory is seen by sys.path I don't know why the
import statement keeps failing.