consider ditching some best practices

[natebrennand]

possibly skip some best practices:

if __name__ == "__main__":

app = Flask(__name__)

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I think this is a good idea because the explanations for those are not necessary for learning flask or to make it run.

This runs just fine:

from flask import Flask

app = Flask('my_app')

@app.route("/")
def hello():
    return "Hello World!"

app.run(host="0.0.0.0")