Python CSV错误

Question

大家好，我一直在收集这个错误，同时使一个小程序来排序大的CSV文件，下面是我的代码和错误，我做错了什么？

if selection: 
     for stuff in stuffs: 

      try: 
       textFile = open("output.txt",'w') 
       mycsv = csv.reader(open(stuff)) 
       d_reader = csv.DictReader(mycsv) 
       headers = d_reader.fieldnames <-- Error happens here 
       if selection in headers: 
        placeInList = headers.index(selection) 

        #placeInList = selection.index(selection) 
        for selection in tqdm(mycsv, desc='Extracting column values...', leave = True): 
         textFile.write(str(selection[int(placeInList)])+'\n') 
        print 'Done!' 
        textFile.close() 
        sys.exit() 
      except IOError: 
       print 'No CSV file present in directory' 
       sys.exit() 
    else: 
     sys.exit() 

和错误：的

Traceback (most recent call last): 
File "postcodeExtractor.py", line 27, in <module> headers = d_reader.fieldnames 
File "C:\Python27\lib\csv.py", line 90, in fieldnames self._fieldnames = self.reader.next() 
TypeError: expected string or Unicode object, list found 

Answer 1

代替

mycsv = csv.reader(open(stuff)) 
d_reader = csv.DictReader(mycsv) 

你想

d_reader = csv.DictReader(open(stuff)) 

第一行的问题。