“file”对象没有属性“getitem”

Question

我的代码有问题，它总是有错误'file' object has no attribute '__getitem__'。这是我的代码：

def passHack():
    import random
    p1 = random.choice(["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"])
    p2 = random.choice(["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"])
    p3 = random.choice(["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"])
    p4 = random.choice(["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"])
    p = (p1 + p2 + p3 + p4)
    g = 0000
    a = 0
    import time
    start_time = time.time()
    print "Working..."
    while (g != p):
        a += 1
        f = open('llll.txt')
        g = f[a]
        print g
        f.close()
    if (g == p):
        print "Success!"
        print "Password:"
        print g
        print "Time:"
        print("%s seconds" % (time.time() - start_time))

def loopPassHack():
    t = 0
    while (t <= 9):
        passHack()
        t += 1
        print "\n"

passHack()

我注意到当我添加g = f[a]时会发生这种情况，但我尝试将属性__getitem__添加到g、f和a，但它仍然返回相同的错误。请帮忙，谢谢你的回复！

Answer 1

作为错误消息状态，文件对象没有__getitem__特殊方法。这意味着您不能像列表一样对它们进行索引，因为__getitem__是处理此操作的方法。

但是，在进入while循环之前，您始终可以将文件读取到列表中：

with open('llll.txt') as f:
    fdata = [line.rstrip() for line in f]
while (g != p):
   ...

然后，可以按原样索引行列表：

a += 1
g = fdata[a]
print g

作为额外的好处，我们不再在循环的每次迭代中打开和关闭文件。相反，它在循环开始之前打开一次，然后在with-statement下面的代码块退出时关闭。

另外，list comprehension和正在每一行上调用^{}，以删除任何后面的换行符。