Hi,
I was replacing some os.path stuff with Pathlib and I discovered this:
Path(256 * "x").is_file() # OSError
os.path.isfile(256 * "x") # bool
Is this intended? Does pathlib try to resemble os.path as closely as
possible?
Best wishes,
Albert-Jan

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Albert-Jan Roskam <sjeik_appie@hotmail.com> wrote or quoted:

I was replacing some os.path stuff with Pathlib

Don't try to fix it if it ain't broke!

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Albert-Jan Roskam <sjeik_appie@hotmail.com> wrote or quoted:

Path(256 * "x").is_file() # OSError
os.path.isfile(256 * "x") # bool
Is this intended?

When something is documented and behaves accordingly,
we assume it was intended.

Does pathlib try to resemble os.path as closely as possible?

No.

The definition of "isfile" contains:

|except (OSError, ValueError):
| return False

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On 3/8/2024 1:03 PM, Albert-Jan Roskam via Python-list wrote:

Hi,
I was replacing some os.path stuff with Pathlib and I discovered this:
Path(256 * "x").is_file() # OSError
os.path.isfile(256 * "x") # bool
Is this intended? Does pathlib try to resemble os.path as closely as
possible?

You must have an very old version of Python. I'm running 3.12.2 and it
returns False. Either that or that path name exists and throws some
kind of unexpected exception.

The Python docs say

"Return True if the path points to a regular file (or a symbolic link
pointing to a regular file), False if it points to another kind of file.

False is also returned if the path doesn’t exist or is a broken symlink; other errors (such as permission errors) are propagated"

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On 3/8/2024 2:21 PM, Grant Edwards via Python-list wrote:

On 2024-03-08, Thomas Passin via Python-list <python-list@python.org> wrote:

On 3/8/2024 1:03 PM, Albert-Jan Roskam via Python-list wrote:

Hi,
I was replacing some os.path stuff with Pathlib and I discovered this: >>> Path(256 * "x").is_file() # OSError
os.path.isfile(256 * "x") # bool
Is this intended? Does pathlib try to resemble os.path as closely as >>> possible?

You must have an very old version of Python. I'm running 3.12.2 and it
returns False.

It throws OSError with Python 3.11.8 on Linux.

Sorry, I should have said on Windows.

$ python
Python 3.11.8 (main, Feb 23 2024, 16:11:29) [GCC 13.2.1 20240113] on linux Type "help", "copyright", "credits" or "license" for more information.

import pathlib
pathlib.Path(256 * "x").is_file()

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.11/pathlib.py", line 1267, in is_file
return S_ISREG(self.stat().st_mode)
^^^^^^^^^^^
File "/usr/lib/python3.11/pathlib.py", line 1013, in stat
return os.stat(self, follow_symlinks=follow_symlinks)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 36] File name too long: '

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x'

import os
os.path.isfile(256 * "x")

False

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On 8 Mar 2024 18:31:07 GMT, Stefan Ram wrote:

Albert-Jan Roskam <sjeik_appie@hotmail.com> wrote or quoted:

I was replacing some os.path stuff with Pathlib

Don't try to fix it if it ain't broke!

I can’t see the point of pathlib. It just seems to be trying to paper over the differences between Windows and *nix systems. Does anybody still care
about being compatible with native-Windows any more? After all, that’s
what WSL is for.

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On Mar 8, 2024 19:35, Thomas Passin via Python-list
<python-list@python.org> wrote:

On 3/8/2024 1:03 PM, Albert-Jan Roskam via Python-list wrote:
> Hi,
> I was replacing some os.path stuff with Pathlib and I discovered
this:
> Path(256 * "x").is_file() # OSError
> os.path.isfile(256 * "x") # bool
> Is this intended? Does pathlib try to resemble os.path as closely
as
> possible?

You must have an very old version of Python. I'm running 3.12.2 and it
returns False. Either that or that path name exists and throws some
kind of unexpected exception.

====
Hi, I tested this with Python 3.8. Good to know that this was fixed!

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On 3/8/2024 5:14 PM, Albert-Jan Roskam wrote:

On Mar 8, 2024 19:35, Thomas Passin via Python-list
<python-list@python.org> wrote:

On 3/8/2024 1:03 PM, Albert-Jan Roskam via Python-list wrote:
>     Hi,
>     I was replacing some os.path stuff with Pathlib and I
discovered this:
>     Path(256 * "x").is_file()  # OSError
>     os.path.isfile(256 * "x")  # bool
>     Is this intended? Does pathlib try to resemble os.path as
closely as
>     possible?

You must have an very old version of Python.  I'm running 3.12.2 and it
returns False.  Either that or that path name exists and throws some
kind of unexpected exception.

====

Hi, I tested this with Python 3.8. Good to know that this was fixed!

We just learned a few posts back that it might be specific to Linux; I
ran it on Windows.

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On 8 Mar 2024, at 23:19, Thomas Passin via Python-list <python-list@python.org> wrote:

We just learned a few posts back that it might be specific to Linux; I ran it on Windows.

Depending on the exact win32 api used there is a 257 limit on windows.
The 257 includes 2 for the device, C:, and 255 for the path part that will use 1 for the leading \. Getting an error for a name that is 255 is not surprising.

Other api allow for 65535 limit, not sure on its additional limits.

Barry

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On 3/10/2024 6:17 AM, Barry wrote:

On 8 Mar 2024, at 23:19, Thomas Passin via Python-list <python-list@python.org> wrote:

We just learned a few posts back that it might be specific to Linux; I ran it on Windows.

Depending on the exact win32 api used there is a 257 limit on windows.
The 257 includes 2 for the device, C:, and 255 for the path part that will use 1 for the leading \. Getting an error for a name that is 255 is not surprising.

Other api allow for 65535 limit, not sure on its additional limits.

I seem to remember there is a setting to allow longer paths, but I
forget any details.

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On Mar 10, 2024 12:59, Thomas Passin via Python-list
<python-list@python.org> wrote:

On 3/10/2024 6:17 AM, Barry wrote:
>
>
>> On 8 Mar 2024, at 23:19, Thomas Passin via Python-list
<python-list@python.org> wrote:
>>
>> We just learned a few posts back that it might be specific to Linux;
I ran it on Windows.
>
> Depending on the exact win32 api used there is a 257 limit on windows.
> The 257 includes 2 for the device, C:, and 255 for the path part that
will use 1 for the leading \. Getting an error for a name that is 255 is
not surprising.
>
> Other api allow for 65535 limit, not sure on its additional limits.

I seem to remember there is a setting to allow longer paths, but I
forget any details.

=====
You mean the "\\?\" prefix?
https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

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On 3/10/2024 9:33 AM, Albert-Jan Roskam wrote:

On Mar 10, 2024 12:59, Thomas Passin via Python-list
<python-list@python.org> wrote:

On 3/10/2024 6:17 AM, Barry wrote:
>
>
>> On 8 Mar 2024, at 23:19, Thomas Passin via Python-list
<python-list@python.org> wrote:
>>
>> We just learned a few posts back that it might be specific to
Linux; I ran it on Windows.
>
> Depending on the exact win32 api used there is a 257 limit on
windows.
> The 257 includes 2 for the device, C:, and 255 for the path part
that will use 1 for the leading \. Getting an error for a name that
is 255 is not surprising.
>
> Other api allow for 65535 limit, not sure on its additional limits.

I seem to remember there is a setting to allow longer paths, but I
forget any details.

=====

You mean the "\\?\" prefix?

https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

That and there's a registry setting:

https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation

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On 10 Mar 2024, at 14:49, Thomas Passin via Python-list <python-list@python.org> wrote:

That and there's a registry setting:

https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation

Yep that and rules about size of parts of the path.

Barry

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