当表名已经存在时，我想显示一条消息，但还要再次询问一个新的表名

Question

I want to verify if a table exist, if exist I want to show a message "Table already exist" and ask again user to enter a new name for table.

But when user enter a table name that already exist, Im getting only the message "Table already exist" but its not asking again to enter the name for the table.

Do you know why its not working?

def validField(info):
    field = ""
    while not field:
        field = raw_input(info)
        if not field:
            print "Empty field"
    return field

def createTable():
    tableName = validField("Please enter the name for table: ")
    try:
        verifyTable = test.get_table(tableName)
    except BotoServerError:
        print "Table already exist" 
        tableName = validField("Please enter the name for table: ")

Answer 1

How about:

def createTable():
    ok = False
    while not ok:
        try:
            verifyTable = test.get_table(raw_input("Please enter the name for table: "))
            ok = True
        except BotoServerError:
            print "Table already exist"