def add_bcc(<EOL>self,<EOL>bcc_email,<EOL>global_substitutions=None,<EOL>is_multiple=False,<EOL>p=<NUM_LIT:0>):
if isinstance(bcc_email, str):<EOL><INDENT>bcc_email = Bcc(bcc_email, None)<EOL><DEDENT>if isinstance(bcc_email, tuple):<EOL><INDENT>bcc_email = Bcc(bcc_email[<NUM_LIT:0>], bcc_email[<NUM_LIT:1>])<EOL><DEDENT>if isinstance(bcc_email, Email):<EOL><INDENT>p = bcc_email.personalization<EOL><DEDENT>self._set_emails(<EOL>bcc_email,<EOL>global_substitutions,<EOL>is_multiple=is_multiple,<EOL>p=p)<EOL>
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