TypeError：＆＃39; file＆＃39;对象没有属性＆＃39; __ getitem __＆＃39;

Question

以下代码应该从cat.txt中获取字符串并在名为cat_results.txt的文件上打印结果

def aln_count(aln_file):

                     .......................

    aln_file=open(aln_file,'r')
    lines=aln_file.readlines()

                     .......................

    with open(aln_file[:-4]+'_results.txt') as aln_r:
        aln_results = [line.rstrip() for line in aln_r]

    for seq in sequences:
        for i in range(3,len(lines)-1):
            if seq in lines[i]:
                result.append(lines[i+1])
        F=result.count('F')    
        aln_results.write('')
        aln_results.write(seq)
        aln_results.write('F: '+str(F)+' ')

    aln_r.close()
    result_file.close()

aln_count('cat.txt')

我得到的错误信息如下：

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-21-f603fc5d22c0> in <module>()
     32     result_file.close()
     33 
---> 34 aln_count('cat.txt')

<ipython-input-21-f603fc5d22c0> in aln_count(aln_file)
     10             sequences.append(line[0:4])
     11 
---> 12     with open(aln_file[:-4]+'_results.txt') as aln_r:
     13         aln_results = [line.rstrip() for line in aln_r]
     14 

TypeError: 'file' object has no attribute '__getitem__'

如何摆脱此错误？

Answer 1

您目前在代码中覆盖aln_file变量，以便它现在代表一个文件对象，位于aln_file=open(aln_file,'r')行。

当您稍后尝试在with open(aln_file[:-4]+'_results.txt') as aln_r中访问它时，您现在正在尝试切片文件对象而不是传递给该函数的原始输入，这将引发错误。

更改变量名称，应更正此错误：

aln_file_object = open(aln_file, 'r')
lines = aln_file_object.readlines()