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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_fields(self, table_name, **kwargs):
 """return all the fields for the given table"""

        ret = {}
        query_str = 'PRAGMA table_info({})'.format(self._normalize_table_name(table_name))
        fields = self._query(query_str, **kwargs)
        #pout.v([dict(d) for d in fields])

        query_str = 'PRAGMA foreign_key_list({})'.format(self._normalize_table_name(table_name))
        fks = {f["from"]: f for f in self._query(query_str, **kwargs)}
        #pout.v([dict(d) for d in fks.values()])

        pg_types = {
            "INTEGER": int,
            "BIGINT": long,
            "DOUBLE PRECISION": float,
            "FLOAT": float,
            "REAL": float,
            "NUMERIC": decimal.Decimal,
            "BOOLEAN": bool,
            "DATE": datetime.date,
            "TIMESTAMP": datetime.datetime,
            "CHARACTER": str,
            "VARCHAR": str,
            "TEXT": str,
            "BLOB": bytearray,
        }

        # the rows we can set: field_type, name, field_required, min_size, max_size,
        #   size, unique, pk, <foreign key info>
        # These keys will roughly correspond with schema.Field
        # TODO -- we could actually use "type" to get the size because SQLite returns
        # a value like VARCHAR[32]
        for row in fields:
            field = {
                "name": row["name"],
                "field_required": bool(row["notnull"]) or bool(row["pk"]),
                "pk": bool(row["pk"]),
            }

            for tname, ty in pg_types.items():
                if row["type"].startswith(tname):
                    field["field_type"] = ty
                    break

            if field["pk"] and field["field_type"] is int:
                # we compensate for SQLite internally setting pk to int
                field["field_type"] = long

            if row["name"] in fks:
                field["schema_table_name"] = fks[row["name"]]["table"]
                field["ref_table_name"] = fks[row["name"]]["table"]

            ret[field["name"]] = field

        return ret