Adds a Cc object to the Personalization object

        :param to_emails: An Cc object
        :type to_emails: Cc
        :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

def add_cc(
            self, cc_email, global_substitutions=None, is_multiple=False, p=0):
        """Adds a Cc object to the Personalization object

        :param to_emails: An Cc object
        :type to_emails: Cc
        :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(cc_email, str):
            cc_email = Cc(cc_email, None)
        if isinstance(cc_email, tuple):
            cc_email = Cc(cc_email[0], cc_email[1])
        if isinstance(cc_email, Email):
            p = cc_email.personalization
        self._set_emails(
            cc_email, global_substitutions, is_multiple=is_multiple, p=p)