Temporarily silence paramiko deprecation warning for cryptography

[corneliusroemer]

When using smart_open with cryptograph >=43.0.0, one gets 2 deprecation warnings at program startup which is a bit annoying. It would be great if smart_open could temporarily silence this warning until there is a fix in paramiko.

See paramiko issue paramiko/paramiko#2419

I encountered this issue as a snakemake user, see snakemake/snakemake#3004

full traceback showing where paramiko is imported:

Traceback (most recent call last):

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/snakemake/common/__init__.py", line 126, in parse_uri
    from smart_open import parse_uri

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/__init__.py", line 34, in <module>
    from .smart_open_lib import open, parse_uri, smart_open, register_compressor  # noqa: E402
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/smart_open_lib.py", line 35, in <module>
    from smart_open import doctools

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/doctools.py", line 21, in <module>
    from . import transport

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/transport.py", line 105, in <module>
    register_transport("smart_open.ssh")

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/transport.py", line 49, in register_transport
    submodule = importlib.import_module(submodule)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/smart_open/ssh.py", line 37, in <module>
    import paramiko

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/paramiko/__init__.py", line 22, in <module>
    from paramiko.transport import (

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/paramiko/transport.py", line 93, in <module>
    from paramiko.dsskey import DSSKey

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/paramiko/dsskey.py", line 37, in <module>
    from paramiko.pkey import PKey

  File "/opt/homebrew/Caskroom/miniforge/base/envs/py11/lib/python3.11/site-packages/paramiko/pkey.py", line 23, in <module>
    raise Exception("import of paramiko")

Exception: import of paramiko

[ddelange]

I think no changes needed on smart_open: this looks like a transient issue with a fix on the way: paramiko/paramiko#2421

for the time being you can pin/install cryptography<43 in your env