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我在 PostgreSQL DB 上使用 pg_trgm 进行相似性搜索，我需要将结果返回到 PostGIS 表，但是我收到了这个程序员错误，我了解到这个错误与我尝试相同查询的 sql 查询的语法有关在 PostgreSQL 中并且它工作，但无法让它与 python 一起工作。我使用什么（Windows 10、Python 3.8、PostgreSQL 12.6）

class OSMGeocoder(object):
    """ A class to provide geocoding features using an OSM dataset in PostGIS."""
    def __init__(self, db_connectionstring):
        #db initialize db connection parameters
        self.db_connectionstring = db_connectionstring
        
    def geocode(self, placename):
        """ Geocode a given place name."""
        # here we crete the connection object
        conn = psycopg2.connect(self.db_connectionstring)
        cur = conn.cursor()
        #this is the core sql query, using triagrams to detect streets similar to a given placename
        #here we execute the sql and return all of the results
        cur.execute("SELECT name, name <-> '%s' AS weight, ST_AsText(ST_Centroid(wkb_geometry)) AS point FROM public.osm_roads ORDER BY weight LIMIT 10;" % placename)
        rows = cur.fetchall()
        conn.commit()
        cur.close()
        conn.close()
        return rows
if __name__ =='__main__':
    # the user must provide at least two parameters, the place name and the connection string to PostGIS
    if len(sys.argv) < 3 or len(sys.argv) > 3:
        print("usage: <placename> <connection string>")
        raise SystemExit
    placename = sys.argv[1]
    db_connectionstring = sys.argv[2]
    #here we instantiate the geocoder, providing the needed PostGIS connection parameters
    geocoder = OSMGeocoder(db_connectionstring)
    #here we query the geocode methiod, for getting the geocoded points for the given placenames
    results = geocoder.geocode(placename)
    print(results)

ProgrammingError：无效 dsn：在连接信息字符串中的“C:\Users\Lenovo\AppData\Roaming\jupyter\runtime\kernel-ee3068bc-0b95-4bba-a373-752c8196980f.json”之后缺少“=”

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