A simple module to allow Python scripts to upgrade themselves. (WIP)

autofib-screencast.json

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      "-rw-r--r--  1 gherman  staff     0 Oct 13 15:30 autofib-screencast.json\r\n-rw-r--r--@ 1 gherman  staff  1946 Oct 13 15:21 autofib.py\r\n-rw-r--r--@ 1 gherman  staff  6110 Oct 13 15:20 autoupgrade.py\r\n"
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      "usage: autofib.py [-h] [--version] [--verbose] [--upgrade-check] [--upgrade]\r\n\r\nReturn n-th Fibonacci number.\r\n\r\noptional arguments:\r\n  -h, --help       show this help message and exit\r\n  --version        Show version and quit.\r\n  --verbose        Be more verbose.\r\n  --upgrade-check  Check for available upgrade\r\n  --upgrade        Perform upgrade to latest version\r\n\r\nCopyleft 2017, Dinu Gherman\r\n\u001b[0m\u001b[0m\u001b[0m"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      "\b\u001b[K"
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      1.8e-05,
      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠋\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153..."
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153..."
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    ],
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    ],
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      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠹\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
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      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠼\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠴\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
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    [
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    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠇\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠏\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠋\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.085105,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m"
    ],
    [
      3.9e-05,
      "\u001b[0m\u001b[0m\u001b[?25h\u001b[0m\u001b[0m\u001b[0m\u001b[32m✔\u001b[39m Loaded gist 4812aff91b6e87fee79ee59308f41153\r\n\u001b[0m"
    ],
    [
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      "\u001b[0m"
    ],
    [
      5.2e-05,
      "\u001b[0m\r\u001b[0m\u001b[0m"
    ],
    [
      1.7e-05,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\u001b[?25h\u001b[0m\u001b[0m\u001b[0m"
    ],
    [
      0.00098,
      "\u001b[0m"
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    [
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      "\u001b[0m"
    ],
    [
      0.039547,
      "bash-3.2$ "
    ],
    [
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      "python autofib.py --upgrade --verbose"
    ],
    [
      3.139657,
      "\b"
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      0.169338,
      "\b"
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      "\b"
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    [
      0.021485,
      "\b"
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    [
      0.019205,
      "\b"
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    [
      0.016215,
      "\b"
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    [
      0.199661,
      "\b"
    ],
    [
      0.198129,
      "\b"
    ],
    [
      0.158803,
      "\b"
    ],
    [
      0.624916,
      "- --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.1064,
      "- --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.324989,
      "c --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.572395,
      "\b\u001b[1P --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.126915,
      "\b\u001b[1P --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.162993,
      "\b\u001b[1P --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.754729,
      "- --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.158848,
      "c --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.213126,
      "h --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.086112,
      "e --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.819989,
      "c --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      0.035855,
      "k --verbose\b\b\b\b\b\b\b\b\b\b"
    ],
    [
      1.186396,
      "\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C\u001b[C"
    ],
    [
      0.512598,
      "\r\n"
    ],
    [
      0.334239,
      "\u001b[?25l\u001b[0m"
    ],
    [
      3.4e-05,
      "\u001b[0m"
    ],
    [
      1.9e-05,
      "\u001b[0m"
    ],
    [
      0.000201,
      "\r\u001b[0m"
    ],
    [
      1.8e-05,
      "\u001b[0m"
    ],
    [
      0.0001,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠋\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153..."
    ],
    [
      2.3e-05,
      "\u001b[0m\u001b[0m"
    ],
    [
      0.00028,
      "\u001b[0m\r"
    ],
    [
      0.008649,
      "\u001b[0m"
    ],
    [
      0.001241,
      "\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m"
    ],
    [
      3.2e-05,
      "\u001b[0m\r\u001b[1m\u001b[36m⠙\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.083931,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠹\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.084752,
      "\u001b[0m\r\u001b[0m\u001b[0m"
    ],
    [
      3e-05,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠸\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m"
    ],
    [
      2.4e-05,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠼\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.084936,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K"
    ],
    [
      3e-05,
      "\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠴\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m"
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      2.3e-05,
      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠦\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m"
    ],
    [
      2.4e-05,
      "\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠇\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠏\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.084454,
      "\u001b[0m\r\u001b[0m\u001b[0m"
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      2.2e-05,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠋\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.081332,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠙\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠹\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.084568,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠸\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠼\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.083682,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠴\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.084825,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠦\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m"
    ],
    [
      2.8e-05,
      "\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m"
    ],
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      2.1e-05,
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      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠇\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠏\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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    ],
    [
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      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠋\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.085157,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠙\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.08306,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠹\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m"
    ],
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      2.5e-05,
      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠸\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠼\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      0.084486,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠴\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.08402,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠦\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠇\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠏\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
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    ],
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      "\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠙\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m"
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    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠹\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠸\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠼\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠴\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
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    ],
    [
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      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠦\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m"
    ],
    [
      3.2e-05,
      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠧\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠇\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.083579,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\r\u001b[1m\u001b[36m⠏\u001b[0m Loading gist 4812aff91b6e87fee79ee59308f41153...\u001b[0m\u001b[0m"
    ],
    [
      0.085001,
      "\u001b[0m\r\u001b[0m\u001b[0m\u001b[0m\u001b[K\u001b[0m"
    ],
    [
      2.7e-05,
      "\u001b[0m\u001b[0m\u001b[?25h\u001b[0m\u001b[0m\u001b[0m\u001b[32m✔\u001b[39m Loaded gist 4812aff91b6e87fee79ee59308f41153\r\n\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\r\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m\u001b[K\u001b[0m\u001b[0m\u001b[0m\u001b[?25h\u001b[0m"
    ],
    [
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      "\u001b[0m\u001b[0m"
    ],
    [
      0.000396,
      "This version (0.0.3) is up to date.\u001b[0m\u001b[0m\u001b[0m\r\n\u001b[0m\u001b[0m\u001b[0m"
    ],
    [
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      "\u001b[0m"
    ],
    [
      1.8e-05,
      "\u001b[0m"
    ],
    [
      0.044884,
      "bash-3.2$ "
    ]
  ]
}

autoupgrade.py

#!/usr/bin/env python

"""
A simple module to allow Python scripts to upgrade themselves.

So far this only supports upgrading single Python files from versioned
GitHub gists as "repositories", see https://gist.github.com. The gists
are accessed using the GitHub API with basic authentication and the
environment variables GITHUB_USER and GITHUB_PASSWORD.

WARNINGS:

- This is a proof of concept and not production level code!
  Make sure you have backups of any files you are upgrading!

- If you find this script inside a GitHub gist, be warned that
  its gist ID might change without notice! In this case please
  look for similar filenames until this might become part of
  a proper package...
"""

import re
import os
import sys
import json
import argparse
from distutils.version import LooseVersion

import requests
try:
    from halo import Halo
    HAVE_HALO = True
except ImportError:
    HAVE_HALO = False

__version__ = "0.0.0"


class MockHalo(object):
    """
    A mocking Halo context manager, only printing the passed text on stdout.
    """
    def __init__(self, *args, **kwargs):
        if "text" in kwargs:
            print(kwargs["text"])
    
    def __enter__(self):
        return self

    def __exit__(self, *exc):
        return False

    def succeed(self, text):
        print(text)

    def fail(self, text):
        print(text)


class SilentHalo(MockHalo):
    """
    A mocking Halo context manager doing nothing.
    """
    def __init__(self, *args, **kwargs):
        pass

    def succeed(self, text):
        pass

    def fail(self, text):
        pass


if not HAVE_HALO:
    Halo = MockHalo


class GistUpgrader(object):
    """
    Upgrader for code taking GitHub gists as repositories.
    
    This provides access to a GitHub gist defined by its SHA-1 ID, allows
    to pick any file with some known name and some desired version string
    inside any of its revisions, and replace the locally installed file
    with the same name.
    
    Script versions have to be strings assigned to an __version__ variable
    (as it is usually defined on the top level). Only the first found will be
    used.
    """
    def __init__(self, gist_id, auth=None, verbose=False):
        self.gist_id = gist_id
        self.version_pattern = "\d[\d.]*" # FIXME: improve lousy pattern!
        self.auth = auth
        if not self.auth:
            self.auth = (os.getenv("GITHUB_USER"), os.getenv("GITHUB_PASSWORD"))

        H = Halo if verbose else SilentHalo
        text = "gist {}".format(self.gist_id)
        with H(text="Loading {}...".format(text), spinner="dots") as spinner:
            self.info = self.load_repo()
            spinner.succeed("Loaded {}".format(text)) # FIXME: show full URL!

    def load_repo(self):
        """
        Load relevant data from remote repository and store it locally.
        """
        # [{filename1: {content: ..., size: ...}}, {filename1: ...}]
        url = "https://api.github.com/gists/{}".format(self.gist_id)
        gist = requests.get(url, auth=self.auth).json()
        info = [v["url"] for v in gist["history"]]
        info = [requests.get(url, auth=self.auth).json()["files"] for url in info]
        return info

    def extract_version(self, code, version_pattern=None):
        """
        Determine the version of some Python source code.
        """
        if version_pattern:
            self.version_pattern = version_pattern
        pat = """__version__\s*=\s*\"({})\"""".format(self.version_pattern)
        version_str = re.findall(pat, code)[0]
        return version_str

    def get_all_versions(self, filename):
        """
        Get all versions for all available variants of the code.
        
        Returns a list of (version-str, raw-url) pairs.
        """
        versions = [
            (self.extract_version(v[filename]["content"]), v[filename]["raw_url"])
                for v in self.info if filename in v
        ]
        return versions

    def get_script(self, filename, version="latest"):
        """
        Get specified version of a script.
        """
        ext_ver = self.extract_version
        versions = sorted([
            (LooseVersion(ext_ver(v[filename]["content"])), v[filename]["content"])
                for v in self.info if filename in v
        ])
        ## FIXME: raise error if no such filename found
        ## FIXME: raise error if no such version for given filename found
        if version == "latest":
            return versions[-1][1]
        versions = [(v, content) for (v, content) in versions if str(v)==version]
        return versions[0][1]

    def upgrade_script(self, path, version="latest", verbose=False):
        """
        Upgrade an installed program consisting of a single script.
        """
        current_code = open(path).read()
        current_version = self.extract_version(current_code)
        new_script_content = self.get_script(os.path.basename(path), version=version)
        new_version = self.extract_version(new_script_content)
        if LooseVersion(new_version) <= LooseVersion(current_version):
            return
        script_abs_path = os.path.abspath(path)
        args = (script_abs_path, current_version, new_version)
        open(script_abs_path, 'w').write(new_script_content)
        if verbose:
            text = "Upgraded {} from version {} to {}.".format(*args)
            Halo().succeed(text)
            
    def upgrade_check(self, filename, some_version, verbose=False):
        """
        Check if there are newer versions and report all of them.
        
        Return a list of version strings newer than ``some_version``.
        """
        updates = [
            ver for (ver, url) in self.get_all_versions(filename)
                if LooseVersion(ver) > LooseVersion(some_version)
        ]
        if verbose:
            if updates:
                print("Available updates: {}. This version is {}."\
                      .format(updates, some_version))
            else:
                print("This version ({}) is up to date.".format(some_version))
        return updates

You can see a recorded terminal session here. Or you download autoupgrade.pyand autofib-screencast.json from this gist and autofib.py v. 0.0.2 from its own gist. Then run the screencast with asciinema play autofib-screencast.json (see asciinema.org). And replicate locally (you'll need environment variables GITHUB_USER and GITHUB_PASSWPRD with your values set appropriately).