Importing from within package

[Terry Reedy]

On 9/22/2020 8:31 PM, Chris Angelico wrote:
> On Wed, Sep 23, 2020 at 9:24 AM Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:
>>
>> On Tue, 22 Sep 2020 20:14:01 +0400, Abdur-Rahmaan Janhangeer
>> <arj.python at gmail.com> declaimed the following:
>>
>>> I have this main script:
>>> https://github.com/Abdur-rahmaanJ/shopyo/blob/dev/shopyo/__main__.py
>>>
>>
>>          Well, that file name scares me...
>>
>>          __main__ is the name Python uses internally for the, well, main program
>> (whatever the real file name is), and becomes part of the convention
>>
>> if __name__ == "__main__":
>>          #running as stand-alone program
>>          #do stuff
>>
>> where imported files will appear with the name by which they were imported.
>>
> 
> In a package, __main__.py does that same job.

I am not sure of your intended meaning.

Assume that director 'mypac' is in a directory on sys.path.  Forget 
namespace packages, which I have not studied.
'import mypac' within code imports mypac/__init__.py
'python -m mypac' on a command line runs mypac/__main__.py

Example: .../pythonxy/lib/idlelib. lib is on sys.path.
idlelib/__init__.py is nearly empty.
idlelib/__main__.py starts IDLE,
so 'python -m idlelib' on a command line starts idle.


-- 
Terry Jan Reedy