Is there any way to execute Python script via PostgreSQL function?

I have python script saved as a text file named test.py on my Desktop.

I need to execute that script using PostgreSQL.

Currently I am trying to create PostgreSQL function:

CREATE FUNCTION database.test()
RETURNS VOID
AS $$
py /C:/Users/User1/Desktop/test.py
$$ LANGUAGE plpython3u

That gives me an error:

ERROR:  SyntaxError: invalid syntax (<string>, line 3)could not compile PL/Python function "test" 

ERROR:  could not compile PL/Python function "test"
SQL state: 38000
Detail: SyntaxError: invalid syntax (<string>, line 3)

from sqlalchemy import create_engine
import pandas as pd


db_config = {'user': '******', 
    'pwd': '*******',
    'host': '*******',
    'port': ****,
    'db': '*******'} 

connection_string = 'postgresql://{}:{}@{}:{}/{}'.format(db_config['user'],
    db_config['pwd'],
    db_config['host'],
    db_config['port'],
    db_config['db'])

engine = create_engine(connection_string) 

test_df = pd.DataFrame(index=[0,1], columns= ['A', 'B'], data = 0)


test_df\
.to_sql(
    'test_2',
    schema='database',
    con=engine,
    if_exists='replace',
    index=False
)

Could someone tell me what am I doing wrong?