我有一个GeoJSON文件，我需要用Python将几何图形导入到Postgres DB中。我试过这个：

...
cursor = conn.cursor()
data = json.load(json_file)
for row in data['features']
    geometry = row['geometry']
    params = (geometry)
    cursor.callproc('ST_GeomFromGeoJSON', params)
    wkb_geometry = cursor.fetchone()[0]
    sql = "INSERT INTO tbl(wkb_geometry) VALUES (%s)"
    val = (wkb_geometry)
    cursor.execute(sql, val)
    conn.commit()
...

字符串
我得到这个错误：

function st_geomfromgeojson(typt => unknown, coordinates => numeric[]) does not exist
LINE 1: SELECT * FROM ST_GeomFromGeoJSON("type":='Polygon',"coordina...

HINT: No function matches the given name and argument types. You might need to add explicit type casts.

型
我不知道如何添加建议的显式类型转换。