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我在我的程序中做的是： 

1. Reading an input file which has 4 columns(All are strings except first column)
2. Splitting them into 4 fields using split()
3. Making last column values as keys and second column values as values
4. If a key already exists, appending the value to the existing item

示例输入文件是： 

66.518706001    00:27:10:2b:93:84       ff:ff:ff:ff:ff:ff       gsdtestopen
72.753800001    00:27:10:2b:93:84       ff:ff:ff:ff:ff:ff       gsdtestopen
90.646014001    00:13:e0:d8:c5:42       ff:ff:ff:ff:ff:ff       alpha_phone
90.646018001    00:13:e0:d8:c5:42       ff:ff:ff:ff:ff:ff       alpha_phone

我的代码如下： 

ssid = dict()
with open("luawrite", "r") as f:
    for line in f:
            hashes = line.split("\t")
            if(hashes[3] != ""):
                    emp = hashes[3]
                    if emp in ssid.keys():
                            ssid[emp].append(hashes[1])
                    else:
                            ssid[emp] = hashes[1]
    print ssid
f.close()

我在运行此代码时遇到的错误是： 

Traceback (most recent call last):
File "ssidcategorize.py", line 10, in <module>
ssid[emp].append(hashes[1])
AttributeError: 'str' object has no attribute 'append'

我知道我不能附加到字符串，但是这个问题没有好转吗？

4

1 回答 1

1

将每个值改为列表（或其他一些多值类型）。

else:
    ssid[emp] = [hashes[1]]

...

    ssid[emp].add(hashes[1])
else:
    ssid[emp] = set([hashes[1]])
于 2013-06-28T22:46:43.980 回答