Python程序删除文本文件中的特定行 [英] Python program to delete a specific line in a text file

问题描述

我有一个包含以下几行的文本文件 Thailand_Rectangle2_National Parks.txt.

I have a text file Thailand_Rectangle2_National Parks.txt with the following lines.

1
2
3
4
5
dy 0.5965
7

现在，我想删除此文本文件中的第 6 行.

Now, I want to delete the 6th line in this text file.

为此，我使用了以下 python 代码.

For that, I am using the following python code.

f = open("C:/Users/Sreeraj/Desktop/Thailand_Rectangle2_National Parks.txt","r")
lines = f.readlines()

因此，我将这个文本文件的所有行保存在行"中.

So, I saved all the lines of this text file in 'lines'.

line6 = lines[5]
t = line6[:2]
f.close() 

所以，现在，我有 't' = "dy" .现在，

So, now, I have 't' = "dy" . Now,

if t == "dy":
    f = open("C:/Users/Sreeraj/Desktop/Thailand_Rectangle2_National Parks.txt","w")
    for line in lines:
        if lines[5] != line6:
            f.write(line)

f.close()

所以，如果条件 't' = "dy" 满足，那么我将打开此文本文件进行写入，并将打印除第 6 行之外的所有行(这意味着从该文本文件中删除了第 6 行).

So, if the condition 't' = "dy" satisfies, then I will open this text file for writing and I will print all the lines except line6 (which means line6 is deleted from this text file).

不幸的是，我得到这个文本文件中的行为空白，这意味着没有行被打印为输出.

Unfortunately, I am getting the lines in this text file as blank, which means no lines are printed as outputs.

但是，我希望文本文件中的行如下所示.

But, I want the lines in the text file as given below.

1
2
3
4
5
7

我该如何解决这个问题?

How can I solve this issue ?

我只想用Python编程来解决这个问题；因为这是一项大工程的小任务.

I want to use only Python programming to solve this issue; since this is a small task of a major work.

推荐答案

你的问题是 lines[5] 将 always 等于 line6.您从未修改过 lines 中的第六行，因此 line6 和 lines[5] 仍然相等.因此，条件 lines[5] != line6 将始终失败.

Your problem is that lines[5] will always be equal to line6. You never modified the sixth line in lines, so line6 and lines[5] are still equal. Thus, the condition lines[5] != line6 will always fail.

如果您想始终从文件中删除第六行，您可以使用 enumerate.例如:

If you want to always remove the sixth line from your file, you can use enumerate. For example:

with open("file.txt", "r") as infile:
    lines = infile.readlines()

with open("file.txt", "w") as outfile:
    for pos, line in enumerate(lines):
        if pos != 5:
            outfile.write(line)

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