psycopg2.ProgrammingError:“select”处或附近出现语法错误

我有一个python脚本,它读取一个sql文件并执行其中存储的sql命令。但在执行时,我犯了以下错误:

psycopg2.ProgrammingError: syntax error at or near "select"
LINE 1: select * from image

sql文件内容为:

从图像中选择*

这很简单,应该是正确的。

 cur=conn.cursor()
 string=open(script,'r',encoding='utf-8').read()#script is the sql file
 cur.execute(string)

有人能给你建议吗?

----更新-----

def list_(csv, sql=None , script=None , host = None, dbname=None , user=None , pwd=None):
    print(sql)
    print(script)
    if (sql):
        print("sql")
        with conn2db(host,dbname,user,pwd) as conn:
            cur = conn.cursor()
            cur.execute(sql)
    if (script):
        print("script")
        with conn2db(host,dbname, user, pwd) as conn:
            cur = conn.cursor()
            string =  open(script, 'r', encoding='utf-8').read()
            print(string)
            cur.execute(string)
            #cur.execute(open(script, 'r', encoding='utf-8').read())
    with open(csv,'w') as file:
        for record in cur:
            mystr=str(record)[1:-2] if str(record)[-1]==',' else str(record)[1:-1]
            file.write(mystr+'\n')
            #file.write('\n')