在python3

Question

我是psycopg2版本2.6.1 我想获取一些错误，但它没有像预期的那样工作：

try:
    pgconn = psycopg2.connect(database="foobar", host="dbtest.example.de", user="postgresss")
except psycopg2.OperationalError:
    print(psycopg2.OperationalError.pgerror)
   .....:     
<member 'pgerror' of 'psycopg2.Error' objects>

或：

try:                       
    pgconn = psycopg2.connect(database="foobar", host="dbtest.example.de", user="postgresss")
except psycopg2.OperationalError:
    print(psycopg2.OperationalError.diag)
   .....:     
<attribute 'diag' of 'psycopg2.Error' objects>

我怎样才能看到正确的消息，例如＆＃34;没有pg_hba.conf主机xyz＆＃34;

Answer 1

您需要引用异常实例：

try:
    pgconn = psycopg2.connect(database="foobar", host="dbtest.example.de", user="postgresss")
except psycopg2.OperationalError as e:
    print(e)