how to post multiple value with same key in python requests?

Dictionary keys must be unique, you can’t repeat them. You’d use a sequence of key-value tuples instead, and pass this to data:

requests.post(url, data=[('interests', 'football'), ('interests', 'basketball')])

Alternatively, make the values of the data dictionary lists; each value in the list is used as a separate parameter entry:

requests.post(url, data={'interests': ['football', 'basketball']})

Demo POST to http://httpbin.org:

>>> import requests
>>> url="http://httpbin.org/post"
>>> r = requests.post(url, data=[('interests', 'football'), ('interests', 'basketball')])
>>> r.request.body
'interests=football&interests=basketball'
>>> r.json()['form']
{u'interests': [u'football', u'basketball']}
>>> r = requests.post(url, data={'interests': ['football', 'basketball']})
>>> r.request.body
'interests=football&interests=basketball'
>>> r.json()['form']
{u'interests': [u'football', u'basketball']}

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