def create_reaction(self, reaction_type):
assert isinstance(reaction_type, (str, unicode)), "<STR_LIT>"<EOL>assert reaction_type in ["<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>"],"<STR_LIT>"<EOL>post_parameters = {<EOL>"<STR_LIT:content>": reaction_type,<EOL>}<EOL>headers, data = self._requester.requestJsonAndCheck(<EOL>"<STR_LIT:POST>",<EOL>self.url + "<STR_LIT>",<EOL>input=post_parameters,<EOL>headers={'<STR_LIT>': Consts.mediaTypeReactionsPreview}<EOL>)<EOL>return github.Reaction.Reaction(self._requester, headers, data, completed=True)<EOL>
:calls: `POST /repos/:owner/:repo/issues/:number/reactions <https://developer.github.com/v3/reactions>`_
:param reaction_type: string
:rtype: :class:`github.Reaction.Reaction`