The Perils Of Software Engineering

Transcript

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   Andrew Godwin @andrewgodwin PERILS OF THE SOFTWARE ENGINEERING

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   Andrew Godwin Hi, I'm Django Core Developer Senior Engineer at

   Far too many hobbies
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   "Perils"

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   Computer Science ≠ Software Engineering

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   Engineering Mechanical Civil Software Chemical Materials

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   Mechanical Engineering https://www.flickr.com/photos/mariaeklind/

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   Nondeterministic

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   Cost of Entry

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   Civil Engineering

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    Timescales

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    Cost of Failure

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    Aerospace Software Engineering

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    Cost of Failure

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    Failure: When, not if

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    Margaret Hamilton, 1969

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    Apollo 11 LM, "Eagle"

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    Web/App Software Engineering

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    Quick to build and test

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    Minimal equipment costs

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    Well-paid

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    Well-paid

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    Explicit is better than Implicit

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    Code Indirection

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    class MyView(View): def get(self, request): return self.render(request, "template.html")

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    class MyView(FormView, AuditMixin, OtherMixin): def get(self, request): return self.render(request, "template.html")

    class AuditMixin(BaseAuditor, AdditionalStuff): ... class OtherMixin(MyObject, SomethingElse): ...
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    Async Uncertainty

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    def async_handler(): with open("my_file.txt", "r") as fh: write_socket(1, fh.read()) redis.incr("key1",

    2)
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    Schemas

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    { "id": 342, "name": "David", "weight": 74, } { "id":

    342, "name": "Ellie", "weight": "85kg", } { "id": 342, "nom": "Frankie", "weight": 77, } { "id": 342, "name": "Frankie", "weight": -67, }
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    Clever code is bad Maintainable code is good

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    xs = [number for inner in nested if len(inner) >

    2 for number in inner]
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    for inner in nested: if len(inner) > 2: for number

    in inner: xs.append(number)
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    Explore and Discard

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    There is no perfect solution

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    Throwing everything away rarely works

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    Backwards compatability is your friend

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    Nobody is a genius; we're all mediocre

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    Argue over code, not over ideas

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    Well-paid

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    10 years? 100 years? 1000 years?

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    Who will access it?

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    What format will it be?

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    Is it even important?

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    Over thousands of years, the machine memories have been filled

    with programs that can help “ “ A Deepness In The Sky Vernor Vinge
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    Engineering is collaborative

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    Build well.

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    Thanks. Andrew Godwin @andrewgodwin