docs: def change_email(self, email):
          """
          Changes the email address for a user.
  
          A user needs to verify this new email address before it becomes
          active. By storing the new email address in a temporary field 
          -- ``temporary_email`` -- we are able to set this email address 
          after the user has verified it by clicking on the verification URI 
          in the email. This email gets send out by ``send_verification_email``.
  
          :param email:
              The new email address that the user wants to use.
  
          """
          self.email_unconfirmed = email
  
          salt, hash = generate_sha1(self.username)
          self.email_confirmation_key = hash
          self.email_confirmation_key_created = get_datetime_now()
          self.save()
  
          # Send email for activation
          self.send_confirmation_email()
          
          return self