獲得psycopg2誤差python3

Question

我以前做的psycopg2版本2.6.1 我想獲取一些錯誤，但它excpected不工作：

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> 

哪有我看到正確的消息，如「沒有pg_hba.conf主機xyz條目」

Answer 1

您需要參考例外實例：

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