如何在Python中解析双引号的csv文件?

时间:2019-06-03 10:14:45

标签: python python-3.x csv

我正在尝试解析用25 引用的csv。 因此,基本上该文件如下所示:

"'

我尝试解析以下内容:

"'test1'","'test2'","'test3'","'test4'"
"'value1'","'value2'",,"'value4'"

我希望密钥为import csv from pprint import pprint inputCsv = "test.csv" with open(inputCsv, 'r', newline='') as csvfile: dictReader = csv.DictReader(csvfile, quotechar='"', delimiter=',', quoting=csv.QUOTE_ALL, doublequote=True) for line in dictReader: pprint(line) # print(line["'test1'"]) # works, but only with "'test1'", not "test1" or 'test1'; also result is 'value1' not value1 -因此我可以使用test1(而不是line["test1"])和它的值为line["'test1'"]来访问它,而无需附加引号

是否可以不遍历整个字典并在解析后删除每个元素的引号吗?

在线示例: https://repl.it/repls/WoefulDeafeningMacroinstruction

2 个答案:

答案 0 :(得分:3)

您可以定义自己的阅读器来解决迭代期间 的问题(警告:未经测试的代码,但至少应该可以使您入门):

class MyReader(csv.reader):
    def __next__(self):
        row = super().__next__()
        return [value.strip("'") for value in row]

class MyDictReader(csv.DictReader):
    def __init__(self, f, fieldnames=None, restkey=None, restval=None,
                 dialect="excel", *args, **kwds):
        super().__init__(f, fieldnames, restkey, restval, dialect, *args, *kwds)
        self.reader = MyReader(f, dialect, *args, **kwds)

答案 1 :(得分:1)

这有点round回,但是如果我们以CSV格式读取文件两次,我们将得到所需的内容:

import csv
from pprint import pprint
from io import StringIO

inputCsv = "test.csv"

with open(inputCsv, 'r', newline='') as csvfile:
    csvReader = csv.reader(csvfile, quotechar='"', delimiter=',')
    dequotedStringIO = StringIO()
    csvWriter = csv.writer(dequotedStringIO, quoting=csv.QUOTE_NONE)
    csvWriter.writerows(csvReader)
    dequotedLines = dequotedStringIO.getvalue().splitlines()
    dictReader = csv.DictReader(dequotedLines, quotechar="'")
    for line in dictReader:
        print(line['test1'])

因此,首先我们有一个直接的csv.reader来解析外部引号;然后我们将所有数据发送回直接的csv.writer,并告诉它不要引用任何内容。实际上,这会以尊重CSV语义的方式剥离外部双引号,并且您会得到一个仅包含单引号的兼容CSV文件,您可以将其传递到csv.DictReader中以获得所需的最终结果。