https://www.jianshu.com/p/e01738be4f8d

# 1. 打开
file_read = open("README")
file_write = open("REAMDE[复件]", "w")

# 2. 读、写
while True:
    # 读取一行内容
    text = file_read.readline()

    # 判断是否读取到内容
    if not text:
        break

    file_write.write(text)

# 3. 关闭
file_read.close()
file_write.close()