Python CSV DictReader / Writer问题
发布时间:2020-12-20 13:05:33 所属栏目:Python 来源:网络整理
导读:我试图从CSV文件中提取一堆行并将它们写入另一行,但我遇到了一些问题. import csvf = open("my_csv_file.csv","r")r = csv.DictReader(f,delimiter=',')fieldnames = r.fieldnamestarget = open("united.csv",'w')w = csv.DictWriter(united,fieldnames=fiel
我试图从CSV文件中提取一堆行并将它们写入另一行,但我遇到了一些问题.
import csv f = open("my_csv_file.csv","r") r = csv.DictReader(f,delimiter=',') fieldnames = r.fieldnames target = open("united.csv",'w') w = csv.DictWriter(united,fieldnames=fieldnames) while True: try: row = r.next() if r.line_num <= 2: #first two rows don't matter continue else: w.writerow(row) except StopIteration: break f.close() target.close() 运行此,我收到以下错误: Traceback (most recent call last): File "unify.py",line 16,in <module> w.writerow(row) File "C:Program FilesPython25libcsv.py",line 12 return self.writer.writerow(self._dict_to_list(row File "C:Program FilesPython25libcsv.py",line 12 if k not in self.fieldnames: TypeError: argument of type 'NoneType' is not iterable 不完全确定我错了什么. 解决方法
我也不知道,但是因为你所做的只是将行从一个文件复制到另一个文件,你为什么要烦扰csv呢?为什么不是这样的:
f = open("my_csv_file.csv","r") target = open("united.csv",'w') f.readline() f.readline() for line in f: target.write(line) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |