Reintroduce Pythonic syntax for ADLS Gen2

[kasuteru]

azure.storage.filedatalake for ADLS Gen2 feels rather unintuitive and more convoluted than the ADLS Gen1 python SDK.

What used to be a few simple, pythonic lines of code tends to now need complex queries or weird, unpythonic syntaxes. A few examples below:

exists:

Python syntax:

os.path.exists(path)

ADLS Gen1 syntax

client.exists(path)

ADLS Gen2 workaround:

def exists(fs_client, path):
    parent = PurePosixPath(path).parent

    for i in fs_client.get_paths(path=parent, recursive=False):
        if PurePosixPath(i.name) == path: return True
    return False

exists(client, path)

mv:

Python syntax:
shutil.move(src, dest)

Gen1:
client.mv(src, dest)

Gen 2:

fs_client.get_file_client(src)
file_client.rename(dest)

I see lots of people re-implementing the intuitive, pythonic syntax from Gen1. I think this should rather be done centrally by Microsoft instead of 3rd-party-libraries.

[tasherif-msft]

Hi @kasuteru, thank you very much for all your suggestions :) as you know we're constantly working on our track 2 SDK to improve it. We recently added the exists method to our container and blob clients. I can definitely see the value in adding this for Datalake as well.
I will have a discussion regarding the mv() operation as we also need to maintain consistency with the SDKs in different languages.
I will update you on both these items!

[tasherif-msft]

Hi @kasuteru, the exists() feature will be added to all the datalake clients and a PR is currently open. It will be shipped in the next release.
the mv() method however will not be added in the meantime as rename() is sufficient.
Thank you!

[kasuteru]

Thanks for the feedback and adding exists!