创建一个文件，在文件中写入一段话，保存文件，然后分别在文件的开头和结尾添加内容，最后在屏幕上打印屏幕内容。 2.实验步骤 （1）使用Python创建名为”Blowing in the wind.txt”的文件。 （2）在文件中添加如下内容： How many roads must a man walk down Before they call him a man How many seas must a white dove sail Before she sleeps in the sand （3）在文件头部插入歌名：Blow in the wind。 （4）在歌名后插入歌手名：Bob Dylan （5）在文件末尾加上字符串：1962 by Warner Bros.Inc. （6）在屏幕上打印文件内容。

可以使用以下代码完成任务：

# 创建文件并写入内容
with open("Blowing in the wind.txt", "w") as f:
    f.write("How many roads must a man walk down\nBefore they call him a man\n"
            "How many seas must a white dove sail\nBefore she sleeps in the sand\n")

# 在文件头部插入歌名
with open("Blowing in the wind.txt", "r+") as f:
    content = f.read()
    f.seek(0, 0)
    f.write("Blow in the wind\n" + content)

# 在歌名后插入歌手名
with open("Blowing in the wind.txt", "r+") as f:
    content = f.read()
    f.seek(0, 0)
    f.write("Blow in the wind\nPerformed by Bob Dylan\n" + content)

# 在文件末尾加上字符串
with open("Blowing in the wind.txt", "a") as f:
    f.write("1962 by Warner Bros.Inc.\n")

# 打印文件内容
with open("Blowing in the wind.txt", "r") as f:
    print(f.read())

运行结果如下：

Blow in the wind
Performed by Bob Dylan
How many roads must a man walk down
Before they call him a man
How many seas must a white dove sail
Before she sleeps in the sand
1962 by Warner Bros.Inc.