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Python: While using the requests library and an API, how do I change the header "Content-Type" to JSON?

I've been trying to use an api on a website for awhile now and the responses from the api return the data in xml. I want the response to be in JSON format, but when I try adding a header into the http request, it keeps sending the response in xml.
I've tried the following code:
import requests
param_list = {'key1': 'value1'}
headers = {'Content-Type': 'application/json'}
url = 'api url'
response = requests.get(url=url, params=param_list, headers=headers,)
print(response.text)
print(response.headers)
The second print statement shows that the 'Content-Type' header returns "text/html"
Any idea on how to fix this? Thanks for your time and help!

how to fetch data from API using python

I have to get data from rest api using python. how to send headers to retrieve data from API. is there any module for requesting data from API.

Try requests it has two method get() and post()
Please try:
import requests
import json
res = requests.get('paste your link here')
response = json.loads(res.text)

Previous answers have covered the idea behind how to fetch data from an API using python. Requests library is a natural selection if you want to achieve this.
Documentation and ref: https://requests.readthedocs.io/en/master/
Installation: pip install requests or https://requests.readthedocs.io/en/master/user/install/#install
Coming to the last part - how to send headers to retrieve data from API?
You can pass headers as dictionary to the request.
url = 'https://api.github.com/some/endpoint'
headers = {'user-agent': 'my-app/0.0.1'}
response = requests.get(url, headers=headers)
Now you have the response object in response variable; now it's up to you what you want to achieve. e.g. If you want to see what is the response body as String;
print(response.text)

Yes python has requests lib to make a call to POST and GET methods
e.g.
import requests
url = 'web address'
params = {'key':'value'}
r = requests.get(url = url, params = params)
response = r.json()

Python Requests API call not working

I'm having an issue converting a working cURL call to an internal API to a python requests call.
Here's the working cURL call:
curl -k -H 'Authorization:Token token=12345' 'https://server.domain.com/api?query=query'
I then attempted to convert that call into a working python requests script here:
#!/usr/bin/env python
import requests
url = 'https://server.domain.com/api?query=query'
headers = {'Authorization': 'Token token=12345'}
r = requests.get(url, headers=headers, verify=False)
print r
I get a HTTP 401 or 500 error depending on how I change the headers variable around. What I do not understand is how my python request is any different then the cURL request. They are both being run from the same server, as the same user.
Any help would be appreciated

Hard to say without knowing your api, but you may have a redirect that curl is honoring that requests is not (or at least isn't send the headers on redirect).
Try using a session object to ensure all requests (and redirects) have your header.
#!/usr/bin/env python
import requests
url = 'https://server.domain.com/api?query=query'
headers = {'Authorization': 'Token token=12345'}
#start a session
s = requests.Session()
#add headers to session
s.headers.update(headers)
#use session to perform a GET request.
r = s.get(url)
print r

I figured it out, it turns out I had to specify the "accept" header value, the working script looks like this:
#!/usr/bin/env python
import requests
url = 'https://server.domain.com/api?query=query'
headers = {'Accept': 'application/app.app.v2+json', 'Authorization': 'Token token=12345'}
r = requests.get(url, headers=headers, verify=False)
print r.json()

Posting a json data in url -- Python

I have JSON data stored in a variable in [{"totalspend": 3240.650785131, "dailybudget": 50.0}] format.
I am trying to post this JSON data to a url using:
import requests
r = requests.post("myurl", myjson)
but I am not able to see the result on my url after executing the code.

Your server most likely expects the Content-Type: application/json header to be set:
r = requests.post("myurl", data=myjson,
headers={'Content-Type': 'application/json'})
Do make sure that myjson is an actual JSON string and not a Python list.
If you are using requests version 2.4.2 or newer, you can leave the encoding of the JSON data entirely to the library; it'll set the correct Content-Type header for you automatically. You'd pass in the Python object (not a JSON string) to the json keyword argument:
r = requests.post("myurl", data=myobject)

You need to set headers first :
Try :
import json
import requests
payload = {"totalspend": 3240.650785131, "dailybudget": 50.0}
headers = {'content-type': 'application/json'}
r = requests.post(url, data=json.dumps(payload), headers=headers)

bad request error 400 while using python requests.post function

I'm trying to make a simple post request via the requests library of Python and I get a bad request error (400) while my url is supposedly correct since I can use it to perform a get.
I'm very new in REST requests, I read many tutorials and documentation but I guess there are still things I don't get so my error could be basic. Maybe a lack of understanding on the type of url I'm supposed to send via POST. Here my code :
import requests
v_username = "username"
v_password = "password"
v_headers = {'content-type':'application/rdf+xml'}
url = 'https://my.url'
params = {'param': 'val_param'}
payload = {'data': 'my_data'}
r = requests.post(url, params = params, auth=(v_username, v_password), data=payload, headers=v_headers, verify=False)
print r
I used the example of the requests documentation.

I had a similar problem, i tried changing params to data or with json.dumps():
from json import dumps
r = requests.post(url, params=dumps(params), auth=(v_username, v_password), data=payload, headers=v_headers, verify=False)
or
r = requests.post(url, data=dumps(params), auth=(v_username, v_password), data=payload, headers=v_headers, verify=False)