Question

我是Python的初学者，我试图检查不同行中的两个值何时相同，如果它们相同，我想将该值添加到两行中的上一列中。例如，如果这是我的数据：

'ola', 'b', '', '', 'c323'
'hello', 'i', '',  '', 'c324'
'hi', 'i', '', '', 'c324'

我希望它返回此值：

'ola', 'b', '', '', 'c323'
'hello', 'i', '', 'c324', 'c324'
'hi', 'i', '', 'c324', 'c324'

我尝试了几件事，例如这个：

with open(filename, "r+") as file_one:
    reader_one = csv.reader(file_one, delimiter='\t') 
        with open(filename, "r+") as file_two:
            reader_two = csv.reader(file_two, delimiter='\t') 
                for row in reader_one:
                    corresp_info = row[3]
                    xml_info = row[4]
                    for compare_row in reader_two:
                        xml_compare = compare_row[4]
                        if xml_info == xml_compare:
                            corresp_info = xml_info
                        else:
                            continue

Answer 1

这是我的看法：

myCsv = open(filename, "r+").read().splitlines() #Opens the file and split it by lines
newCsv = [myCsv[0].split(',')] #Adding first line to new CSV
for i in range(1, len(myCsv)):  #looping through lines disregarding the first
     splitted = myCsv[i].split(',')  #split it by commas
     newCsv.append(splitted)  #append it
     for index, j in enumerate(splitted): #looping through comma separated values
           if j == newCsv[i-1][index]: #testing if equal to value of last row
                  newCsv[i-1][index-1] = newCsv[i-1][index] #changing values
                  newCsv[i][index-1] = newCsv[i][index]
newCsv = map(lambda x: ','.join(x), newCsv) #remapping it into a csv like string
open('newFile', 'w').write('\n'.join(newCsv)) #putting it into a new file

请注意，这仅是我如何查看它的一个示例，因此它可能有错别字或错误（即使我尝试不做一些，但我不是在这里为您编写代码，所以我已经未经测试或调试）。由您自己制作代码

如何比较上一行和下一行的CSV列？

1 个答案: