Python/Flask Redefining and Initializing Variables [duplicate]

Question

I have a pretty basic question here, I'm sure, but it's giving me a big headache. I have a flask/python program that, essentially, after a form is submitted, a value of a variable changes and the page refreshes, now including text that shows that variable.

Here is some example code to iterate my idea:

@app.route("/", methods=["GET", "POST"])
def index():
    if request.method == "POST":
        if counter == 'one':
            #stuff happens here
            counter == 'two'
        else:
            if counter == 'two':
                #stuff happens
                counter == 'three'
    else:
        counter == 'one'
return render_template("index.html",counter=counter)
...

Any help? I'm a novice here, so I'm probably just doing something dumb.

saifuddin778 · Accepted Answer · 2018-11-27 03:08:32Z

1

Variable assignment should use = instead of ==.

@app.route("/", methods=["GET", "POST"])
def index():
    if request.method == "POST":
        if counter == 'one':
            #stuff happens here
            counter = 'two'
        else:
            if counter == 'two':
                #stuff happens
                counter = 'three'
    else:
        counter = 'one'

answered Nov 27, 2018 at 3:08

saifuddin778

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Comments

vi_ral · Accepted Answer · 2018-11-27 03:14:20Z

0

You should define your variable at the beginning of your routes file. For example :)

from flask import render_template

counter = 'one'
@app.route("/", methods=["GET", "POST"])
def index():
    if request.method == "POST":
        if counter == 'one':
            #stuff happens here
            counter = 'two'
        else:
            if counter == 'two':
                #stuff happens
                counter = 'three'
    else:
        counter = 'one'

answered Nov 27, 2018 at 3:14

vi_ral

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2 Comments

Rachel K. Over a year ago

This still gives me the error: UnboundLocalError: local variable 'counter' referenced before assignment

vi_ral Over a year ago

Please remember to include counter = 'one' before the method call

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