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Import an optional dependency.
By default, if a dependency is missing an ImportError with a nice
message will be raised. If a dependency is present, but too old,
we raise.
Parameters
----------
name : str
The module name. This should be top-level only, so that the
version may be checked.
extra : str
Additional text to include in the ImportError message.
raise_on_missing : bool, default True
Whether to raise if the optional dependency is not found.
When False and the module is not present, None is returned.
on_version : str {'raise', 'warn'}
What to do when a dependency's version is too old.
* raise : Raise an ImportError
* warn : Warn that the version is too old. Returns None
* ignore: Return the module, even if the version is too old.
It's expected that users validate the version locally when
using ``on_version="ignore"`` (see. ``io/html.py``)
Returns
-------
maybe_module : Optional[ModuleType]
The imported module, when found and the version is correct.
None is returned when the package is not found and `raise_on_missing`
is False, or when the package's version is too old and `on_version`
is ``'warn'``.
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