如果行在python中有特定的单词，如何删除整行

Question

我有一个像这样的.txt文件：

the pen is yellow
pen is yellow
    hi
hello

我想删除包含“笔”字的整行

像这样：

    hi
hello

我试过了

with open("myfile.txt", "r") as f:
    lines = f.readlines()
with open("myfile.txt", "w") as f:
    for line in lines:
        if "pen" in line:
            f.write(line)

- - - - - - - - - - - - - -和 - - - - - - - - - - - -------- 我如何只删除.txt 文件中的“笔”字

Answer 1

首先，您需要将结果放在另一个文件 (myfile2) 上，并且需要在此文件上打印不包含“pen”的行。

with open("myfile.txt", "r") as f:
    lines = f.readlines()
with open("myfile2.txt", "w") as f:
    for line in lines:
        if "pen" not in line:
            f.write(line)
        else:
            f.write("\n")

其次只是替换单词使用 replace(,)

with open("myfile3.txt", "w") as f:
    for line in lines:
        line = line.replace("pp","")
        f.write(line)