CODEWITHSUNDEEP
pythonwebflask
Sparky
Sparky

Reputation: 27

Printing any value to web server with Flask

My question is very simple, when you run this code : 

from flask import Flask
app = Flask(__name__)

@app.route('/')

def hello_world():
    return 'Hello World!'

if __name__ == '__main__':
    app.run()

You will see Hello World! on 127.0.0.1:5000

But I' m trying to change like this, I took "Internal Server Error".

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
    a= 5+10
    return a

if __name__ == '__main__':
    app.run()

Code Source: http://flask.pocoo.org/docs/quickstart/#a-minimal-application

Upvotes: 1

Views: 88

Answers (2)

cpb2
cpb2

Reputation: 816

If you are still learning Flask, it would be a good idea to enable debug mode.

app.debug = True
app.run()

Or pass it as a parameter to run:

app.run(debug=True)

This way, you'll see more than just a 500 error.

Upvotes: 1

utdemir
utdemir

Reputation: 27216

Your hello_world method should return a str or file-like object, but in this case you're returning an int. Just cast:

@app.route('/')
def hello_world():
    a = 5 + 10
    return str(a)

Upvotes: 2

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