python截取文本

def sclip():
    with open("file.txt", "r") as file:
        lines = file.readlines()
    first_line = lines[0:2]
    last_10_lines = lines[5:]

    first_line.extend(last_10_lines)
    with open("output.txt", "w") as file:
        file.writelines(first_line)
        file.writelines(last_10_lines)

def getCharByLine(char,lines):
    for i, line in enumerate(lines):
        index = line.find(char)
        if index != -1:
            return i + 1;
    return None

if __name__ == '__main__':
    # with open("file.txt", "r") as file:
    #     lines = file.readlines()
    sclip();