Question

我试图创建一个程序来在CSV文件中存储名称列表，并且试图添加一个删除行的功能，该功能无法正常工作，因为它删除了CSV文件中的所有内容。 / p>

我尝试使用writer.writerow（row），但该方法无效。

        memberName = input("Please enter a member's name to be deleted.")
        imp = open('mycsv.csv' , 'rb')
        out = open('mycsv.csv' , 'wb')
        writer = csv.writer(out)
        for row in csv.reader(imp):
            if row == memberName:
                writer.writerow(row)
        imp.close()
        out.close()

我希望程序仅删除包含memberName的行，但是它将删除CSV文件中的每一行。如何将其更改为仅删除一行？

Answer 1

读取文件时无法写入同一文件。而是使用另一个文件进行输出，例如：

import csv

member_name = input("Please enter a member's name to be deleted: ")

with open('in_file.csv') as in_file, open('out_file.csv', 'w') as out_file:
    reader = csv.reader(in_file)
    writer = csv.writer(out_file)
    for row in reader:
        if member_name not in row:  # exclude a specific row
            writer.writerow(row)

或者，您可以将所需的行存储在内存中，并在重置文件指针之后将它们写回到输入文件：

import csv

member_name = input("Please enter a member's name to be deleted: ")

with open('in_file.csv', 'r+') as in_file:
    reader = csv.reader(in_file)
    rows = [row for row in csv.reader(in_file) if member_name not in row]
    in_file.seek(0)
    in_file.truncate()
    writer = csv.writer(in_file)
    writer.writerows(rows)

Answer 2

这对我有用：您可以将csv文件的内容写到列表中，然后在python中编辑列表，然后将列表写回到csv文件中。

lines = list()
memberName = input("Please enter a member's name to be deleted.")
with open('mycsv.csv', 'r') as readFile:
    reader = csv.reader(readFile)
    for row in reader:
        lines.append(row)
        for field in row:
            if field == memberName:
                lines.remove(row)

with open('mycsv.csv', 'w') as writeFile:
    writer = csv.writer(writeFile)
    writer.writerows(lines)

如何使用python在CSV中仅删除一行

2 个答案: