_fsspec_installed returns True when fsspec isn't installed

[yurivict]

Zarr version

2.14.2

Numcodecs version

0.11.0

Python Version

3.9

Operating System

FreeBSD 13.2

Installation

from port

Description

The function

def _fsspec_installed():
    """Returns true if fsspec is installed"""
    import importlib.util
                
    return importlib.util.find_spec("fsspec") is not None

returns True when fsspec isn't installed.

print(f"_fsspec_installed={_fsspec_installed()}")

Steps to reproduce

n/a

Additional output

No response

[joshmoore]

Hi @yurivict. Sorry to hear you're seeing odd behavior. If I do the following, I see False.

$ conda create -n z1407 zarr
$ conda activate z1407
$ python -c "import zarr.storage as zs; print(zs.FSStore._fsspec_installed())"
False

Is it possible, e.g., that fsspec is being pulled in somewhere else or that a module with that name exists somewhere on your PYTHONPATH?

[yurivict]

Yes, there were some lost files left under /usr/local/lib/python3.9/site-packages/fsspec/ not belonging to any package.

This caused import fsspec to succeed.

Sorry for the noise!

[joshmoore]

NP. Thanks for letting us know.