Forex trading algorithm implementation using Oanda issue

Question

Hi I'm trying to implement a forex trading algorithm using the OANDA api. I created an account in OANDA and the key was generated.

What I tried was to implement the code in

http://jon.io/placing-your-first-forex-trade-with-python.html

I used the following code

import v20

api = v20.Context(
        'api-fxpractice.oanda.com',
        '443',
        token='HERE GOES YOUR API KEY')

response = api.order.market(
             'ACCOUNT ID',
             instrument='EUR_USD',
             units=5000)

print("Response: {} ({})".format(response.status, response.reason))

I'm getting the output as 'Response: 400 (Bad Request)'

I do not understand to create the conf file as explained in the post, given in the following github code.

conf file creation

Can someone kindly let me know the reason for this bad request output and the way to create the conf file.