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devel / comp.lang.python / Re: making your own DirEntry.

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* Re: making your own DirEntry.Antoon Pardon
`- Re: making your own DirEntry.immibis

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Re: making your own DirEntry.

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Subject: Re: making your own DirEntry.
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<470298f6-8e1c-43b4-9693-14b913310c56@DancesWithMice.info>
 by: Antoon Pardon - Sat, 23 Dec 2023 09:48 UTC

Op 22/12/2023 om 21:39 schreef DL Neil via Python-list:
> Antoon,
>
>
> On 12/23/23 01:00, Antoon Pardon via Python-list wrote:
>> I am writing a program that goes through file hierarchies and I am
>> mostly
>> using scandir for that which produces DirEntry instances.
>>
>> At times it would be usefull if I could make my own DirEntry for a
>> specific
>> path, however when I try, I get the following diagnostic:
>>
>>>>> os.DirEntry('snap')
>> Traceback (most recent call last):
>>    File "<stdin>", line 1, in <module>
>> TypeError: cannot create 'posix.DirEntry' instances
>>
>>
>> Does anyone have an idea for why this limitation and how to go around
>> it.
>>
>> At this moment I don't consider pathlib very usefull, it lacks the
>> follow_symlinks parameter in the is_dir, is_file, ... methods.
>
>
> Can't recall ever trying this.
>
>
> The manual (https://docs.python.org/3/library/os.html#os.DirEntry)
> suggests that a DirEntry is one of those Python data-constructs which
> it creates, but we may only use: "cannot create".
>
> Secondly, that a DirEntry object consists of a lot more than the
> directory-name, eg its path.
>
> Thirdly, that os.scandir() deals (only) with concrete directories -
> unlike pathlib's ability to work with both the real thing and abstract
> files/dirs.
>
>
> Why create a DirEntry? Why not go directly to os.mkdir() or whatever?

Because I have functions with DirEntry parameters.

Re: making your own DirEntry.

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Subject: Re: making your own DirEntry.
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 by: immibis - Sat, 23 Dec 2023 10:30 UTC

On 12/23/23 10:48, Antoon Pardon wrote:
> Op 22/12/2023 om 21:39 schreef DL Neil via Python-list:
>> Why create a DirEntry? Why not go directly to os.mkdir() or whatever?
>
> Because I have functions with DirEntry parameters.
>

Python is duck-typed, so it's quite likely that if you pass something
that *looks like* a DirEntry - has the same variables and methods - it
will work. If it walks like a DirEntry and quacks like a DirEntry, it's
a DirEntry.

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