title: extracting .7z file using google colab
body: <p>I have this file with .7z prefix and I am trying to extract the content of it with google colab 
  I have tried this linux instruction below:</p>
  
  <pre><code>!7z img_celeba.7z
  </code></pre>
  
  <p>but unfortunately it give this error below:</p>
  
  <blockquote>
    <p>7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
    p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,2 CPUs Intel(R) Xeon(R) CPU @ 2.30GHz (306F0),ASM,AES-NI)</p>
  </blockquote>
  
  <p>Command Line Error:
  Unsupported command:
  img_celeba.7z</p>
  
  <p>then I tried to install p7zip like below:</p>
  
  <pre><code>!apt-get install p7zip-full
  !p7zip -d file_name.7z
  </code></pre>
  
  <p>I also get this error</p>
  
  <blockquote>
    <p>7-Zip (a) [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
    p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,2 CPUs Intel(R) Xeon(R) CPU @ 2.30GHz (306F0),ASM,AES-NI)</p>
  </blockquote>
  
  <p>Scanning the drive for archives:
  1 file, 734003200 bytes (700 MiB)</p>
  
  <p>Extracting archive: img_celeba.7z
  ERROR: img_celeba.7z
  img_celeba.7z
  Open ERROR: Can not open the file as [7z] archive</p>
  
  <p>ERRORS:
  Unexpected end of archive</p>
  
  <p>Can't open as archive: 1
  Files: 0
  Size:       0
  Compressed: 0</p>
  
  <p>what should I do ??...
  thanks in advance   </p>