Question

我有一个utf-8编码的csv文件，想使用csv.DictReader而不是在链接中的类UnicodeReader中使用csv.Reader - https://docs.python.org/2/library/csv.html

class UTF8Recoder:  
    def __init__(self, f, encoding):  
        self.reader = codecs.getreader(encoding)(f)  
    def __iter__(self):  
        return self  
    def next(self):  
        return self.reader.next().encode("utf-8")  

class UnicodeReader:  
    def __init__(self, f, encoding="utf-8"):  
        f = UTF8Recoder(f, encoding)  
        self.reader = csv.DictReader(f, delimiter=b',')  
    def next(self):  
        row = self.reader.next()  
        return [unicode(s, "utf-8") for s in row]  
    def __iter__(self):  
        return self  

def csv_dict_reader(file_obj):  
    reader = UnicodeReader(file_obj)  
    for line in reader:  
        val = line [“first_column”]  

if __name__ == "__main__":  
    try:  
        with open(“abcd.csv") as f_obj:  
         csv_dict_reader(f_obj)  
    except IOError:  
        print "Error: can\'t find file - tz_2k3.csv or read data"  
        raise SystemExit

我收到错误＆＃34; TypeError：列表索引必须是整数，而不是unicode＆＃34;

Answer 1

什么是TypeError？

异常TypeError ：将操作或函数应用于不适当类型的对象时引发。关联值是一个字符串，提供有关类型不匹配的详细信息。 Just click on me for more information.

<强>演示：

>>> l1 = ["value1", "value2", "value3"]
>>> type(l1) 
<type 'list'>
>>> l1[2]   # Need index to access item from the list.
'value3'
>>> l1["value1"]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not str
>>>

Answer 2

我的同事通过修改UnicodeReader类中的next方法修复了这个问题，由于UTF-8 BOM字符存在一些问题

def next(self):  
    d = self.reader.next()  
    return {unicode(k, "utf-8").strip(u'\ufeff'): unicode(v, "utf-8").strip(u'\ufeff') for k, v in d.items()}

TypeError：list indices必须是整数，而不是unicode

2 个答案: