Python3 替换文件中的字符串

def repalcebytext(address, ori_str, target_str):
    all_data = ''
    with open(address, 'r+', encoding="UTF-8") as f:
        for line in f.readlines():
            if line.find(ori_str) != -1:
                line = target_str

            all_data += line
        f.close()

    with open(address, 'r+', encoding="UTF-8") as f:
        f.truncate()
        f.write(all_data)
        f.close()