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devel / comp.lang.python / Re: Circular Import

SubjectAuthor
* Circular ImportStefano Ovus
`* Re: Circular ImportStefano Ovus
 `- Re: Circular ImportChris Angelico

1
Circular Import

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Subject: Circular Import
From: stefano....@gmail.com (Stefano Ovus)
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 by: Stefano Ovus - Tue, 12 Apr 2022 15:28 UTC

How can I avoid circular imports keeping separated modules ?

-- square.py

from circle import Cirle
class Square:
def __init__(self):
...
@classmethod
def from_circle(cls, circle: Circle) -> Square:
...
return cls(...)

-- circle.py

from square import Square
class Circle:
def __init__(self):
...
@classmethod
def from_square(cls, square: Square) -> Circle:
...
return cls(...)

Re: Circular Import

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Subject: Re: Circular Import
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 by: Stefano Ovus - Tue, 12 Apr 2022 17:22 UTC

found a solution: importing modules instead of classes, ex.

-- square.py

import circle

....
@classmethod
def from_circle(cls, circle: circle.Circle) -> Square:
...
return cls(...)

Re: Circular Import

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From: ros...@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: Circular Import
Date: Wed, 13 Apr 2022 03:47:41 +1000
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 by: Chris Angelico - Tue, 12 Apr 2022 17:47 UTC

On Wed, 13 Apr 2022 at 03:37, Stefano Ovus <stefano.ovus@gmail.com> wrote:
>
> found a solution: importing modules instead of classes, ex.
>
> -- square.py
>
> import circle
>
> ...
> @classmethod
> def from_circle(cls, circle: circle.Circle) -> Square:
> ...
> return cls(...)

Yep! Good solution.

Be aware that this will only work if both modules have fully executed
before the references are actually needed. Usually not a problem, but
if you have code that runs at top-level that needs to refer to the
other module (as opposed to simply defining classes and methods, where
those methods are going to refer to the other module when they get
called), it might not work. But that's no different from any other
circular dependency.

ChrisA

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