<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def lookUpReportsByCountry(self, countryName):
 """ looks up a country by it's name Inputs countryName - name of the country to get reports list. """


        code = self.findCountryTwoDigitCode(countryName)

        if code is None:
            raise Exception("Invalid country name.")
        url = self._base_url + self._url_list_reports + "/%s" % code
        params = {
            "f" : "json",
        }
        return self._post(url=url,
                             param_dict=params,
                             securityHandler=self._securityHandler,
                             proxy_url=self._proxy_url,
                             proxy_port=self._proxy_port)