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```py

     

       
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#! /usr/bin/env nix-shell

     

       
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#! nix-shell -i 'python3.withPackages(ps: [ps.numpy])'

     

       
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+
       
#! nix-shell -i python3 -p 'python3.withPackages(ps: [ps.numpy])'

     

       
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import numpy

     

       
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