python - 从文本文件中删除或清除一行

Question

正如标题一样简单，真的。但不知何故挣扎。

用 boop 删除行

beep
boop 
bop 
Hey 
beep
boop
bop

file_path = "C:\\downloads\\test.txt"
with open(file_path, "r") as f:
    lines = f.readlines()
with open(file_path, "w") as f:
    for line in lines:
        if line.rfind("boop") >= 0:
            f.write(line)

file_in.close()

我不明白完全删除或清除该行的最佳方法。

Answer 1

您可以以读写模式打开文件并删除符合条件的行。

with open(file_path, "r+") as fp:
    lines = fp.readlines()
    fp.seek(0)
    for line in lines:
        if "boop" not in line:
            fp.write(line)
    fp.truncate()

seek 重置文件指针。

引用:using Python for deleting a specific line in a file