input_validation.py 文件源码

def verify_indices_all_unique(obj):
    """
    Check that all axes of a pandas object are unique.

    Parameters
    ----------
    obj : pd.Series / pd.DataFrame / pd.Panel
        The object to validate.

    Returns
    -------
    obj : pd.Series / pd.DataFrame / pd.Panel
        The validated object, unchanged.

    Raises
    ------
    ValueError
        If any axis has duplicate entries.
    """
    axis_names = [
        ('index',),                            # Series
        ('index', 'columns'),                  # DataFrame
        ('items', 'major_axis', 'minor_axis')  # Panel
    ][obj.ndim - 1]  # ndim = 1 should go to entry 0,

    for axis_name, index in zip(axis_names, obj.axes):
        if index.is_unique:
            continue

        raise ValueError(
            "Duplicate entries in {type}.{axis}: {dupes}.".format(
                type=type(obj).__name__,
                axis=axis_name,
                dupes=sorted(index[index.duplicated()]),
            )
        )
    return obj