CODEWITHSUNDEEP
pythonpython-3.xflaskrepeat
Richard Watson
Richard Watson

Reputation: 5

Python Flask: Same Response Returned for New Request

Python newbie here. I have a basic Flask API to price check a car's make and model.

Expected Behavior: The purpose is to send a GET request to the server like this:

http://127.0.0.1:5000//EndPoint1?CarMakeModel=ChevySilverado

And the response should return the price: $25000

If I submit a second request like this:

http://127.0.0.1:5000//EndPoint1?CarMakeModel=FordPinto

The response should return the price: $5000

Incorrect Observed Behavior: When I make a GET request for ChevySilverado (like the URL above), it returns $25000 correctly. But when I send a second URL for FordPinto, it returns $25000 again instead of $5000. It will always repeat $25000 as the output.

How can I get this Python code to return $5000 when I submit 'FordPinto' on the second request URL?

Here's the code I've tried:

#PriceCheck.py:

from Flask import request
PriceChecker=[]
Price=[]
PriceChecker= request.args.get('CarMakeModel')
if PriceChecker == 'ChevySilverado':
    Price = '$25000'
if PriceChecker == 'FordPinto':
    Price = '$5000'

#Run.py:

from flask import Flask
app = Flask(__name__)
@app.route('/EndPoint1')
def Response():
    from PriceCheck import PriceChecker
    return str(PriceChecker)
if __name__ == '__main__':
    app.run(debug=True)

Upvotes: 0

Views: 1200

Answers (1)

jwodder
jwodder

Reputation: 57640

Because Price is a module global variable, it is is only set once, when PriceCheck.py is first imported. You should instead wrap the code in PriceCheck.py in a function so that it can be called repeatedly:

New PriceCheck.py:

from Flask import request

def check_price():
    PriceChecker= request.args.get('CarMakeModel')
    if PriceChecker == 'ChevySilverado':
        Price = '$25000'
    if PriceChecker == 'FordPinto':
        Price = '$5000'
    # You also need to handle `PriceChecker` being other values!
    return Price

New Run.py:

from flask import Flask
from PriceCheck import check_price

app = Flask(__name__)

@app.route('/EndPoint1')
def Response():
    return check_price()

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

Upvotes: 4

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