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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 get_custom_query(self):
 """Extracts custom query keys from the index. Parameters which get extracted from the request: `q`: Passes the value to the `SearchableText` `path`: Creates a path query `recent_created`: Creates a date query `recent_modified`: Creates a date query :param catalog: The catalog to build the query for :type catalog: ZCatalog :returns: Catalog query :rtype: dict """

        query = {}

        # searchable text queries
        q = req.get_query()
        if q:
            query["SearchableText"] = q

        # physical path queries
        path = req.get_path()
        if path:
            query["path"] = {'query': path, 'depth': req.get_depth()}

        # special handling for recent created/modified
        recent_created = req.get_recent_created()
        if recent_created:
            date = api.calculate_delta_date(recent_created)
            query["created"] = {'query': date, 'range': 'min'}

        recent_modified = req.get_recent_modified()
        if recent_modified:
            date = api.calculate_delta_date(recent_modified)
            query["modified"] = {'query': date, 'range': 'min'}

        return query