从csv文件创建字典？ [英] Creating a dictionary from a csv file?

问题描述

我试图从csv文件创建一个字典。 csv文件的第一列包含唯一键，第二列包含值。 csv文件的每一行都表示字典中的唯一键，值对。我尝试使用 csv.DictReader 和 csv.DictWriter classes，但我只能找出如何为每一行生成一个新的字典。我想要一个字典。这里是我想要使用的代码：

I am trying to create a dictionary from a csv file. The first column of the csv file contains unique keys and the second column contains values. Each row of the csv file represents a unique key, value pair within the dictionary. I tried to use the csv.DictReader and csv.DictWriter classes, but I could only figure out how to generate a new dictionary for each row. I want one dictionary. Here is the code I am trying to use:

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， c $ c> ValueError：太多值要解压缩（预期2）。如何从csv文件创建一个字典？谢谢。

When I run the above code I get a ValueError: too many values to unpack (expected 2). How do I create one dictionary from a csv file? Thanks.

推荐答案

我相信您要查找的语法如下：

I believe the syntax you were looking for is as follows:

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，您需要：

Alternately, for python <= 2.7.1, you want:

mydict = dict((rows[0],rows[1]) for rows in reader)

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