def __init__(self, key=None, value=None, p=None):
self._key = None<EOL>self._value = None<EOL>self._personalization = None<EOL>if key is not None:<EOL><INDENT>self.key = key<EOL><DEDENT>if value is not None:<EOL><INDENT>self.value = value<EOL><DEDENT>if p is not None:<EOL><INDENT>self.personalization = p<EOL><DEDENT>
Create a CustomArg with the given key and value.

            :param key: Key for this CustomArg
            :type key: string, optional
            :param value: Value of this CustomArg
            :type value: string, optional
            :param p: p is the Personalization object or Personalization
                      object index
            :type p: Personalization, integer, optional