Python打开文件并删除一行

我需要一个导入文件的程序

我的档案是：

1 abc
2 def
3 ghi
4 jkl
5 mno
6 pqr
7 stu.

我想删除第1、6和7行

我已尝试以下方法导入该文件：

f = open("myfile.txt", "r")
lines = f.readlines()
f.close()
f = open("myfile.txt", "w")

if line = 1:
    f.write(line)
f.close

---

您可以按如下方式删除这些行：

lines = []

with open('myfile.txt') as file:
    for line_number, line in enumerate(file, start=1):
        if line_number not in [1, 6, 7]:
            lines.append(line)

with open('myfile.txt', 'w') as file:
    file.writelines(lines)

with open('myfile.txt') as file:
    lines = [line for line_number, line in enumerate(file, start=1) if line_number not in [1, 6, 7]]

with open('myfile.txt', 'w') as file:
    file.writelines(lines)

通过使用Python的

with

命令，它可以确保文件在之后正确关闭。这种方法也可以转换为列表理解，如下所示：

lines = []

with open('myfile.txt') as file:
    for line_number, line in enumerate(file, start=1):
        if line_number not in [1, 6, 7]:
            lines.append(line)

with open('myfile.txt', 'w') as file:
    file.writelines(lines)

with open('myfile.txt') as file:
    lines = [line for line_number, line in enumerate(file, start=1) if line_number not in [1, 6, 7]]

with open('myfile.txt', 'w') as file:
    file.writelines(lines)

---

Python函数用于为返回的每个项返回索引。通过从

1

开始，它可以用来为正在读取的文件提供行号。

很抱歉，这不是一个代码编写服务，您能否显示您的努力和任何错误如果您不导入文件来读取它，请打开它。更改标题。要回答此问题，请逐行阅读，删除文件并只写入所需的行（或将其写入新文件）。

# Open your file and read the lines into a list called input
input = open('my_file.txt', 'r').readlines()

#create a list of lines you want to skip
lines_to_skip = [1, 6, 7]

with open('my_new_file.txt', 'w') as output:
    for i, line in enumerate(input):
        # check to see if the line number is in the list.  We add 1 because python counts from zero.
        if i+1 not in lines_to_skip:
            output.write(line)