# The remove_unused_levels defined here was copied based on the source code
# defined in pandas.core.indexes.muli.py

# For reference, here is a copy of the pandas copyright notice:

# (c) 2011-2012, Lambda Foundry, Inc. and PyData Development Team
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#        from this software without specific prior written permission.

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from distutils.version import LooseVersion

import pandas as pd

# allow ourselves to type checks for Panel even after it's removed
if LooseVersion(pd.__version__) < "0.25.0":
    Panel = pd.Panel
else:

    class Panel:  # type: ignore
        pass


def count_not_none(*args) -> int:
    """Compute the number of non-None arguments.

    Copied from pandas.core.common.count_not_none (not part of the public API)
    """
    return sum([arg is not None for arg in args])
