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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def analyze(self, config_string=None):
 """ Analyze the given container and return the corresponding job object. On error, it will return ``None``. :param string config_string: the configuration string generated by wizard :rtype: :class:`~aeneas.job.Job` or ``None`` """

        try:
            if config_string is not None:
                self.log(u"Analyzing container with the given config string")
                return self._analyze_txt_config(config_string=config_string)
            elif self.container.has_config_xml:
                self.log(u"Analyzing container with XML config file")
                return self._analyze_xml_config(config_contents=None)
            elif self.container.has_config_txt:
                self.log(u"Analyzing container with TXT config file")
                return self._analyze_txt_config(config_string=None)
            else:
                self.log(u"No configuration file in this container, returning None")
        except (OSError, KeyError, TypeError) as exc:
            self.log_exc(u"An unexpected error occurred while analyzing", exc, True, None)
        return None