python 3.2中KeyError的语法错误

Question

我是初学者使用python 3.2，我有一本书的代码都在python 2.6中。我写了一个程序的一部分，并继续得到： 语法错误：语法无效 然后python的IDLE突出显示我的代码中的KeyError之后的逗号：

from tank import Tank

tanks = { "a":Tank("Alice"), "b":Tank("Bob"), "c":Tank("Carol")}
alive_tanks = len(tanks)

while alive_tanks > 1:
    print
    for tank_name in sorted( tanks.keys() ):
        print (tank_name, tanks[tank_name])

    first = raw_input("Who fires? ").lower()
    second = raw_input("Who at? ").lower()

    try:
        first_tank = tanks[first]
        second_tank = tanks[second]
    except KeyError, name:
        print ("No such tank exists!", name)
        continue

Answer 1

而不是

except KeyError, name:

试

except KeyError as name:

它是Python 2.x和Python 3.x之间的区别。第一种形式不再受支持。