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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_bcc( self, bcc_email, global_substitutions=None, is_multiple=False, p=0):
 """Adds a Bcc object to the Personalization object :param to_emails: An Bcc object :type to_emails: Bcc :param global_substitutions: A dict of substitutions for all recipients :type global_substitutions: dict :param is_multiple: Create a new personilization for each recipient :type is_multiple: bool :param p: p is the Personalization object or Personalization object index :type p: Personalization, integer, optional """

        if isinstance(bcc_email, str):
            bcc_email = Bcc(bcc_email, None)
        if isinstance(bcc_email, tuple):
            bcc_email = Bcc(bcc_email[0], bcc_email[1])
        if isinstance(bcc_email, Email):
            p = bcc_email.personalization
        self._set_emails(
            bcc_email,
            global_substitutions,
            is_multiple=is_multiple,
            p=p)