python 去掉\N

可以使用 `.strip()` 方法去掉每行末尾的 '\n'。例如：

with open("file.txt", "r") as f:
    lines = f.readlines()
    for line in lines:
        line = line.strip()
        print(line)

也可以使用列表推导式：

with open("file.txt", "r") as f:
    lines = f.readlines()
    lines = [line.strip() for line in lines]
    print(lines)