title: How to check if shared memory exists?
body: <p>I need to access to a windows shared memory using Python.</p>
  
  <p>I saw at <a href="https://stackoverflow.com/a/26171682">this</a> post that command,</p>
  
  <pre><code>shm = mmap.mmap(0, 512, "Local\\Test")
  </code></pre>
  
  <p>However as I saw it does attached to an existing shared memory but also create  a new one if it not exists. 
  How can I force to attach the shared memory if it exists but not to create one?</p>