Python: How to get multiple variables from a URL in Flask?

Question

I'm trying to get multiple arguments from a url in Flask. After reading this SO answer I thought I could do it like this:

@app.route('/api/v1/getQ/', methods=['GET'])
def getQ(request):
    print request.args.get('a')
    print request.args.get('b')
    return "lalala"

But when I visit /api/v1/getQ/a=1&b=2, I get a TypeError: getQ() takes exactly 1 argument (0 given). I tried other urls, like /api/v1/getQ/?a=1&b=2 and /api/v1/getQ?a=1&b=2, but to no avail.

Does anybody know what I'm doing wrong here? All tips are welcome!

Your function getQ(request) is expecting an argument (request here). That's the problem, your function should not take any argument. — Steeven_b
– Steeven_b, Commented Aug 17, 2016 at 9:18

Martijn Pieters · Accepted Answer · 2014-02-15 11:20:45Z

18

You misread the error message; the exception is about how getQ is called with python arguments, not how many URL parameters you added to invoke the view.

Flask views don't take request as a function argument, but use it as a global context instead. Remove request from the function signature:

from flask import request

@app.route('/api/v1/getQ/', methods=['GET'])
def getQ():
    print request.args.get('a')
    print request.args.get('b')
    return "lalala"

Your syntax to access URL parameters is otherwise perfectly correct. Note that methods=['GET'] is the default for routes, you can leave that off.

edited Feb 15, 2014 at 11:20

answered Feb 15, 2014 at 11:12

Martijn Pieters

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Community · Accepted Answer · 2017-05-23 12:09:01Z

6

You can try this to get multiple arguments from a url in Flask:

--- curl request---

curl -i "localhost:5000/api/foo/?a=hello&b=world"

--- flask server---

from flask import Flask, request

app = Flask(__name__)


@app.route('/api/foo/', methods=['GET'])
def foo():
    bar = request.args.to_dict()
    print bar
    return 'success', 200

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

---print bar---

{'a': u'hello', 'b': u'world'}

P.S. Don't omit double quotation(" ") with curl option, or it not work in Linux cuz "&"

similar question Multiple parameters in in Flask approute

edited May 23, 2017 at 12:09

CommunityBot

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answered Aug 17, 2016 at 4:06

Little Roys

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1 Comment

Bill Gale Over a year ago

The "" with curl for multiple query strings solved the problem that I was beating my head against. TYSM!

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