Question

大家好，并提前致谢。

我正在尝试从两个不同的csv文件中提取不匹配的列字符串，并将结果写入新的cvs文件中。

到目前为止，我已经写了这段代码：

import csv

with open(r'C:\Users\DataAnalyst\Desktop\phonesdata\sms_03.csv', 'r') as sms:
    sms_indices = dict((r[1], i) for i, r in enumerate(csv.reader(sms)))


with open(r'C:\Users\DataAnalyst\Desktop\phonesdata\marketing.csv', 'r') as marketing:
      reader = csv.reader(marketing)
      f3 = open('results.csv', 'w')
      c3 = csv.writer(f3)     


sms_mark = list(marketing)

for sms_03_row in sms:
    row = 1
    found = False
    results_row = sms_03_row  #Moved out from nested loop
    for marketing_row in sms_mark:        
        x = marketing[0]
        if sms_03_row[1] != marketing_row[0]:
            results_row.append(x)
            found = True
            break
    row += 1
    if not found:
        results_row.append('Not found')     
    c3.writerow(results_row)

sms.close()
marketing.close()
f3.close()

然而，我得到了这个：

Traceback (most recent call last):

   File "<ipython-input-5-bc26b28cdf70>", line 1, in <module>
     sms_mark = list(marketing)

ValueError: I/O operation on closed file.

我该如何解决？有了这段代码，我会得到不匹配的字符串吗？

谢谢！

Answer 1

你有一些indentadion问题。无论如何让with语句关注打开和关闭文件，你会没事的：

import csv

with open(r'<path_to_sms>', 'r') as sms, open(r'<path_to_marketing>') as marketing,
     open(r'results.csv', 'w') as f3:
    sms_indices = dict((r[1], i) for i, r in enumerate(csv.reader(sms)))
    reader = csv.reader(marketing)
    c3 = csv.writer(f3)

    sms_mark = list(marketing)
    results_row = []
    # your stuff goes here
    c3.writerow(results_row)

ValueError问题以及如何从两个文件中提取不匹配的字符串？

1 个答案: