将子列表附加到 python 中的另一个列表

Question

with open('LBP_for_paper.csv','r') as csvDataFile:
    datarows = csv.reader(csvDataFile, delimiter=',', quotechar='|')
    nofinding=[]
    rawrow=[]
    for row in datarows:
        if row[1]=='No Finding' and row[2]=='1':
            rawrow = list((row[0]+","+row[1]+","+row[2]+","+row[17]+","+row[18]))
            nofinding.append(rawrow)

    print(nofinding[:2])

我正在从 csv 文件中读取数据行，并希望基于某些列创建自定义的嵌套列表。我想要

list((row[0]+","+row[1]+","+row[2]+","+row[17]+","+row[18]))

应该return一个像

这样的列表

['00030805_000.png,No Finding,1,34777,69373']

它存储在 rawrow 中，然后附加到更大的列表，即 nofinding，但我得到的输出为

[['0', '0', '0', '3', '0', '8', '0', '5', '', '0', '0', '0', '.', 'p', 'n', 'g', ',', 'N', 'o', ' ', 'F', 'i', 'n', 'd', 'i', 'n', 'g', ',', '1', ',', '3', '4', '7', '7', '7', ',', '6', '9', '3', '7', '3'], ['0', '0', '0', '3', '0', '8', '0', '4', '', '0', '0', '0', '.', 'p', 'n', 'g', ',', 'N', 'o', ' ', 'F', 'i', 'n', 'd', 'i', 'n', 'g', ',', '1', ',', '3', '5', '4', '0', '5', ',', '6', '3', '0', '8', '8']]

期望输出

[ ['00030805_000.png,No Finding,1,34777,69373'], ['00030804_000.png,No Finding,1,35405,63088'] ]

谢谢

Answer 1

您的问题是 rawrow = list((row[0]+","+row[1]+","+row[2]+","+row[17]+","+row[18])) 正在将字符串转换为字符列表

如果您想将其保留为逗号分隔的字符串，请将该行替换为以下内容：

rawrow = row[0]+","+row[1]+","+row[2]+","+row[17]+","+row[18]

或更干净：

rawrow = ",".join([row[row_index] for row_index in [0, 1, 2, 17, 18]])

我很好奇你为什么要：

[ ['00030805_000.png,No Finding,1,34777,69373'], ['00030804_000.png,No Finding,1,35405,63088'] ]

而不是这个：

[ ['00030805_000.png','No Finding',1,34777,69373], ['00030804_000.png','No Finding',1,35405,63088] ]

您可以通过以下方式实现：

rawrow = []
for row_index in [0, 1, 2, 17, 18]:
    rawrow.append(row[row_index].split(","))

或一行：

rawrow = [row[row_index].split(",") for row_index in [0, 1, 2, 17, 18]]

此外，您的整个代码可以合并如下：

with open('LBP_for_paper.csv','r') as csvDataFile:
    datarows = csv.reader(csvDataFile, delimiter=',', quotechar='|')
    nofinding = [",".join([row[row_index] for row_index in [0, 1, 2, 17, 18]]) for row in datarows if row[1]=='No Finding' and row[2]=='1']
    print(nofinding[:2])

Answer 2

with open('LBP_for_paper.csv','r') as csvDataFile:
    datarows = csv.reader(csvDataFile, delimiter=',', quotechar='|')
    rawrow = []
    nofindings=[]
    for row in datarows:
        if row[1]=='No Finding' and row[2]=='1':
            rawrow = [''.join(row[row_index]) for row_index in [0, 1, 2, 17, 18] ]
            nofindings.append(rawrow)
    print(nofindings[:3])

解决了我的问题。

将子列表附加到 python 中的另一个列表

Appending a sublist to another list in python

nested-lists

python-3.x