def none_missing(df, columns=None):
    if columns is None:
        columns = df.columns
    try:
        assert not df[columns].isnull().any().any()
    except AssertionError as e:
        missing = df[columns].isnull()
        msg = generic.bad_locations(missing)
        e.args = msg
        raise
    return df
Generate a reference to each |ImagePart| object in the package.
dataset/ETHPy150Open TomAugspurger/engarde/engarde/checks.py/none_missing--crossover with--dataset/ETHPy150Open scanny/python-pptx/pptx/package.py/_ImageParts.__iter__