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.envrc

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+use nix

main.py

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+import numpy as n,pygame as p
+q=(999,)*2
+b=n.random.rand(*q)>.3
+t=p.display
+r=n.roll
+o=p.surfarray.pixels2d(t.set_mode(q))
+while 1:
+ w=sum(r(r(b,a,0),c,1)for a in[-1,0,1]for c in[-1,0,1])
+ b=b&((w==3)|(w==4))|((~b)*(w==3))
+ o[:,:]=0-b
+ t.flip()

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  packages = with pkgs;  [
+    (python3.withPackages ( ps: with ps; [
+      numpy
+      pygame
+      ptpython
+    ]))
+  ];
+}