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comp / comp.lang.python / python3 package import difference?

SubjectAuthor
* python3 package import difference?Tobiah
+- Re: python3 package import difference?Stefan Ram
+- Re: python3 package import difference?Ronaldo Sc
+- Re: python3 package import difference?Chris Angelico
+- Re: python3 package import difference?Cameron Simpson
`* Re: python3 package import difference?Gilmeh Serda
 `- Re: python3 package import difference?Cameron Simpson

1
Subject: python3 package import difference?
From: Tobiah
Newsgroups: comp.lang.python
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From: toby@tobiah.org (Tobiah)
Newsgroups: comp.lang.python
Subject: python3 package import difference?
Date: Wed, 7 Aug 2024 08:35:36 -0700
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I have an old library from 20 some years ago
for use with python2, that is structured like this:

rcs
├── dbi
│   ├── __init__.py
│   ├── dbi.py
│   └── regos.py
└── __init__.py -- *empty*

the __init__.py file under 'rcs' is empty.
The one under rcs.dbi contains:

from dbi import *
from regos import *

With python2, I'd go:

import rcs.dbi

then I'd have access to stuff in regos.py
as:

rcs.dbi.feature() (Where 'feature' is defined in regos.py)

When I do the same import with python3, I get:

Traceback (most recent call last):
File "/home/toby/me", line 1, in <module>
import rcs.dbi
File "/usr/regos-1.0/lib/python/rcs/dbi/__init__.py", line 1, in <module>
from dbi import *
ModuleNotFoundError: No module named 'dbi'

What's changed, and how do I fix it?

Thanks!

Subject: Re: python3 package import difference?
From: Stefan Ram
Newsgroups: comp.lang.python
Organization: Stefan Ram
Date: Wed, 7 Aug 2024 21:00 UTC
References: 1
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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: python3 package import difference?
Date: 7 Aug 2024 21:00:13 GMT
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Tobiah <toby@tobiah.org> wrote or quoted:
>File "/usr/regos-1.0/lib/python/rcs/dbi/__init__.py", line 1, in <module>
>from dbi import *
>ModuleNotFoundError: No module named 'dbi'

The directory of the outermost script executed is in the system path.

E.g., the directory "d" when you invoke "python d/s.py".

To see the system path:

import sys
print( sys.path )

. "dbi" should not be in any of those directories in the system path.
Therefore, it is not found!

You could use a relative import:

from .dbi import *

or manipulate the sys.path (or an "editable install" of dbi might
also help, but I'm not sure about this as I have not tested it).

Subject: Re: python3 package import difference?
From: Ronaldo Sc
Newsgroups: comp.lang.python
Date: Wed, 7 Aug 2024 22:22 UTC
References: 1 2
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Subject: Re: python3 package import difference?
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I believe you will need to track the modules in the folder *dbi *in the
root file '__init__.py'.

So there's an alternative to use the statement __all__ in the root filet
__init__.py, check the link where I find a use case:

*https://sentry.io/answers/what-is-init-py-for-in-python/#using-__init__py-to-run-code-and-control--imports
<https://sentry.io/answers/what-is-init-py-for-in-python/#using-__init__py-to-run-code-and-control--imports>*

References to take more deep in those issues:
PEP-3147 <https://peps.python.org/pep-3147/>
https://docs.python.org/3/tutorial/modules.html
<https://docs.python.org/3/tutorial/modules.html#intra-package-references>
in this link above we have some examples of relative imports:
from . import echo
from .. import formats
from ..filters import equalizer

In your code you're using "import *" , this is not a good practice when
using only some features in your module(s) because you'll inject more
garbage into memory if there are features you're not using.

Share with us the updates on your code.

Ronaldo

Em qua., 7 de ago. de 2024 às 14:40, Tobiah via Python-list <
python-list@python.org> escreveu:

> I have an old library from 20 some years ago
> for use with python2, that is structured like this:
>
> rcs
> ├── dbi
> │ ├── __init__.py
> │ ├── dbi.py
> │ └── regos.py
> └── __init__.py -- *empty*
>
>
> the __init__.py file under 'rcs' is empty.
> The one under rcs.dbi contains:
>
> from dbi import *
> from regos import *
>
>
> With python2, I'd go:
>
> import rcs.dbi
>
> then I'd have access to stuff in regos.py
> as:
>
> rcs.dbi.feature() (Where 'feature' is defined in regos.py)
>
>
> When I do the same import with python3, I get:
>
> Traceback (most recent call last):
> File "/home/toby/me", line 1, in <module>
> import rcs.dbi
> File "/usr/regos-1.0/lib/python/rcs/dbi/__init__.py", line 1, in
> <module>
> from dbi import *
> ModuleNotFoundError: No module named 'dbi'
>
>
> What's changed, and how do I fix it?
>
>
> Thanks!
> --
> https://mail.python.org/mailman/listinfo/python-list
>

Subject: Re: python3 package import difference?
From: Chris Angelico
Newsgroups: comp.lang.python
Date: Wed, 7 Aug 2024 22:43 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: rosuav@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: python3 package import difference?
Date: Thu, 8 Aug 2024 08:43:54 +1000
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On Thu, 8 Aug 2024 at 03:40, Tobiah via Python-list
<python-list@python.org> wrote:
> The one under rcs.dbi contains:
>
> from dbi import *
> from regos import *
>

You probably want these to be package-relative now:

from .dbi import *
from .regos import *

Or, since you're using namespaced imports anyway ("rcs.dbi.feature"),
you may prefer this form:

from . import dbi, regos

ChrisA

Subject: Re: python3 package import difference?
From: Cameron Simpson
Newsgroups: comp.lang.python
Date: Thu, 8 Aug 2024 01:17 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: cs@cskk.id.au (Cameron Simpson)
Newsgroups: comp.lang.python
Subject: Re: python3 package import difference?
Date: Thu, 8 Aug 2024 11:17:56 +1000
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On 07Aug2024 08:35, Tobiah <toby@tobiah.org> wrote:
>When I do the same import with python3, I get:
>
> Traceback (most recent call last):
> File "/home/toby/me", line 1, in <module>
> import rcs.dbi
> File "/usr/regos-1.0/lib/python/rcs/dbi/__init__.py", line 1, in <module>
> from dbi import *
> ModuleNotFoundError: No module named 'dbi'

Python 3 imports are absolute (they start from the top of the package
tree and you have no `dbi` at the top). You want a relative import i.e.:

from .dbi import *

Cheers,
Cameron Simpson <cs@cskk.id.au>

Subject: Re: python3 package import difference?
From: Gilmeh Serda
Newsgroups: comp.lang.python
Organization: Easynews - www.easynews.com
Date: Thu, 8 Aug 2024 21:55 UTC
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Subject: Re: python3 package import difference?
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On Wed, 7 Aug 2024 08:35:36 -0700, Tobiah wrote:

> from dbi import *
> from regos import *

If I change that to:

from .dbi import * ¹
from .regos import * ²

It seems to be working.

In my tests, ¹ contains:
def bar():
pass

² contains:
def testing():
pass
def foo():
pass

>>> rcs.dbi.bar()
>>> rcs.dbi.testing()
>>> rcs.dbi.foo()
>>>

I guess in a sense Py2 was smarter figuring out what whent where and where
it came from. Or it was a bad hack that has been removed.

--
Gilmeh

You can always pick up your needle and move to another groove. -- Tim
Leary

Subject: Re: python3 package import difference?
From: Cameron Simpson
Newsgroups: comp.lang.python
Date: Thu, 8 Aug 2024 23:53 UTC
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From: cs@cskk.id.au (Cameron Simpson)
Newsgroups: comp.lang.python
Subject: Re: python3 package import difference?
Date: Fri, 9 Aug 2024 09:53:52 +1000
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On 08Aug2024 21:55, Gilmeh Serda <gilmeh.serda@nothing.here.invalid> wrote:
>I guess in a sense Py2 was smarter figuring out what whent where and
>where
>it came from. Or it was a bad hack that has been removed.

No, Python 2 offered less control.

1

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