[Tutor] sub-modules and python3

[johnf]

I'm not trying to support python 2 and python 3.

I just want to use python 3.  The issue of using absolute imports seems 
like a hack.  What happens if a user or I need to change the path.  
Should I have to change the all the imports?


I believe I am going to use absolute paths in the end (all I need is a 
good editor to make the changes) but I was hoping to find something that 
would work in a more universal way.


Johnf


On 05/31/2017 12:03 PM, Peter Otten wrote:
> john wrote:
>
>> Hi folks,
>>
>> In the past I used a simple "import filename" for sub-modules in python
>> 2.  With python 3 I have run into errors reported (file not found) using
>> python 2 import statements.  But I'm not asking how to correct the
>> import as I am able to change the way I write the import as a work
>> around - but I'm importing all the files at once.  What I want to know
>> is what is the best practice for my situation.
>>
>> Is there a simple way using python 3  to emulate python 2 imports?
>>
>> Is there a standard python 3 import tool for sub-modules (files)?
>> Any help or thoughts on the matter is welcome.
> Are you talking about intra-package imports? Rather than having Python 3
> emulate Python 2 you could switch on absolute imports in py2:
>
> from __future__ import absolute_import  # must be at the beginning
>                                          # of the module, then
>
> import alpha         # import toplevel alpha.py
> from . import alpha  # import sibling in current package
>
>> Is it acceptable to add/change the os path to allow my app to find the
>> modules/files?
> That is likely to create a big mess; you may end up with two versions of the
> same module, with puzzling results.
>
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