如何在Python中使用内存映射文件？

import mmap
<h1>打开一个文件并创建内存映射</h1><p>with open('large_file.txt', 'r+b') as f:</p>
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                <h1>创建内存映射</h1><pre class='brush:python;toolbar:false;'>mmap_file = mmap.mmap(f.fileno(), 0)

# 读取文件内容
print(mmap_file.readline().decode('utf-8'))

# 写入文件内容
mmap_file.write(b'Hello, memory-mapped file!')

# 关闭内存映射
mmap_file.close()