def absolute_range_name(sheet_name, range_name=None):
    """Return an absolutized path of a range.

    >>> absolute_range_name("Sheet1", "A1:B1")
    "'Sheet1'!A1:B1"

    >>> absolute_range_name("Sheet1", "A1")
    "'Sheet1'!A1"

    >>> absolute_range_name("Sheet1")
    "'Sheet1'"

    >>> absolute_range_name("Sheet'1")
    "'Sheet''1'"

    >>> absolute_range_name("Sheet''1")
    "'Sheet''''1'"

    >>> absolute_range_name("''sheet12''", "A1:B2")
    "'''''sheet12'''''!A1:B2"
    """
    sheet_name = "'{}'".format(sheet_name.replace("'", "''"))

    if range_name:
        return '{}!{}'.format(sheet_name, range_name)
    else:
        return sheet_name