':calls: `PATCH /repos/:owner/:repo/pulls/:number <http://developer.github.com/v3/pulls>`_
:param title: string
:param body: string
:param state: string
:rtype: None'

def edit(self, title=github.GithubObject.NotSet, body=github.GithubObject.NotSet, state=github.GithubObject.NotSet):

    assert ((title is github.GithubObject.NotSet) or isinstance(title, (str, unicode))), title
    assert ((body is github.GithubObject.NotSet) or isinstance(body, (str, unicode))), body
    assert ((state is github.GithubObject.NotSet) or isinstance(state, (str, unicode))), state
    post_parameters = dict()
    if (title is not github.GithubObject.NotSet):
        post_parameters['title'] = title
    if (body is not github.GithubObject.NotSet):
        post_parameters['body'] = body
    if (state is not github.GithubObject.NotSet):
        post_parameters['state'] = state
    (headers, data) = self._requester.requestJsonAndCheck('PATCH', self.url, input=post_parameters)
    self._useAttributes(data)
