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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 _merge_tops_same(self, tops):
        '''
        For each saltenv, only consider the top file from that saltenv. All
        sections matching a given saltenv, which appear in a different
        saltenv's top file, will be ignored.
        '''
        top = DefaultOrderedDict(OrderedDict)
        for cenv, ctops in six.iteritems(tops):
            if all([x == {} for x in ctops]):
                # No top file found in this env, check the default_top
                default_top = self.opts['default_top']
                fallback_tops = tops.get(default_top, [])
                if all([x == {} for x in fallback_tops]):
                    # Nothing in the fallback top file
                    log.error(
                        'The \'%s\' saltenv has no top file, and the fallback '
                        'saltenv specified by default_top (%s) also has no '
                        'top file', cenv, default_top
                    )
                    continue

                for ctop in fallback_tops:
                    for saltenv, targets in six.iteritems(ctop):
                        if saltenv != cenv:
                            continue
                        log.debug(
                            'The \'%s\' saltenv has no top file, using the '
                            'default_top saltenv (%s)', cenv, default_top
                        )
                        for tgt in targets:
                            top[saltenv][tgt] = ctop[saltenv][tgt]
                        break
                    else:
                        log.error(
                            'The \'%s\' saltenv has no top file, and no '
                            'matches were found in the top file for the '
                            'default_top saltenv (%s)', cenv, default_top
                        )

                continue

            else:
                for ctop in ctops:
                    for saltenv, targets in six.iteritems(ctop):
                        if saltenv == 'include':
                            continue
                        elif saltenv != cenv:
                            log.debug(
                                'Section for saltenv \'%s\' in the \'%s\' '
                                'saltenv\'s top file will be ignored, as the '
                                'top_file_merging_strategy is set to \'same\' '
                                'and the saltenvs do not match',
                                saltenv, cenv
                            )
                            continue

                        try:
                            for tgt in targets:
                                top[saltenv][tgt] = ctop[saltenv][tgt]
                        except TypeError:
                            raise SaltRenderError('Unable to render top file. No targets found.')
        return top