我正在尝试从csv文件创建字典。csv文件的第一列包含唯一键,第二列包含值。csv文件的每一行代表字典中的唯一键,值对。我尝试使用csv.DictReaderand csv.DictWriter类,但是我只能弄清楚如何为每一行生成一个新的字典。我要一部字典。这是我尝试使用的代码:
csv.DictReaderand csv.DictWriter
import csv with open('coors.csv', mode='r') as infile: reader = csv.reader(infile) with open('coors_new.csv', mode='w') as outfile: writer = csv.writer(outfile) for rows in reader: k = rows[0] v = rows[1] mydict = {k:v for k, v in rows} print(mydict)
当我运行上面的代码时,我得到一个ValueError: too many values to unpack (expected 2)。如何从csv文件创建一个字典?
ValueError: too many values to unpack (expected 2)
我相信你正在寻找的语法如下:
with open('coors.csv', mode='r') as infile: reader = csv.reader(infile) with open('coors_new.csv', mode='w') as outfile: writer = csv.writer(outfile) mydict = {rows[0]:rows[1] for rows in reader}
或者,对于python <= 2.7.1,你需要:
python <= 2.7.1
mydict = dict((rows[0],rows[1]) for rows in reader)