python - 任何人都可以帮助我解决我在 Python 2.7 中不断遇到的 TypeError 问题吗？

Question

我正在尝试制作一个程序，使用存储在字典中的值来转换每个字母，将用户输入的 5 个字母字符串转换为 float 。这是我的代码:

    kvalues = {"a":1.01, "b":1.02, "c":1.03, "d":1.04, "e":1.05, "f":1.06, "g":1.07, "h":1.08, "i":1.09, "j":1.10, "k":1.11, "l":1.12, "m":1.13, "n":1.14, "o":1.15, "p":1.16, "q":1.17, "r":1.18, "s":1.19, "t":1.20, "u":1.21, "v":1.22, "w":1.23, "x":1.24, "y":1.25, "z":1.26}
    def convert_key(key):
        #converts the key into a float using the values stored in kvalues
        k1 = float(kvalues.get(key[0]))
        k2 = float(kvalues.get(key[1]))
        k3 = float(kvalues.get(key[2]))
        k4 = float(kvalues.get(key[3]))
        k5 = float(kvalues.get(key[4]))
        print k1 + k2 + k3 + k4 + k5
    convert_key(raw_input (Please enter a key:))

当我运行程序时，出现此错误:“TypeError: 'builtin_function_or_method' object has no attribute 'getitem'”。真正令人困惑的部分是当我通过空闲 shell 运行代码时，如下所示:

    key = "koala"
    kvalues = {"a":1.01, "b":1.02, "c":1.03, "d":1.04, "e":1.05, "f":1.06, "g":1.07, "h":1.08, "i":1.09, "j":1.10, "k":1.11, "l":1.12, "m":1.13, "n":1.14, "o":1.15, "p":1.16, "q":1.17, "r":1.18, "s":1.19, "t":1.20, "u":1.21, "v":1.22, "w":1.23, "x":1.24, "y":1.25, "z":1.26}
    k1 = float(kvalues.get(key[0]))
    print k1

效果非常好!有谁知道这里的问题是什么？我是 Python 新手，不太熟悉该语言的细微差别。

这是完整的回溯:

Traceback (most recent call last): 
File "K:\Projects\koala.py", line 73, in <module> menu() 
File "K:\Projects\koala.py", line 10, in menu encrypt() 
File "K:\Projects\koala.py", line 28, in encrypt e_key = convert_key(e_key) 
File "K:\Projects\koala.py", line 67, in convert_key k1 = float(kvalues.get(key[0]))
TypeError: 'builtin_function_or_method' object has no attribute 'getitem' 

当 print 添加到函数的开头时:

    <built-in method lower of str object at 0x0000000002AC7E40>

Answer 1

问题是你在某个地方这样做:

e_key = mystring.lower

当你打算这样做时:

e_key = mystring.lower()

.lower 是一个方法，这意味着它需要像函数一样被调用，所以你需要括号。在第一种方法中，您只需将该方法重新分配给 e_key 变量即可。