Storing a specific part of a dict value into a string - python-3.x

Question

import requests
import json
url = "********"
payload = json.dumps({
"username": "*****",
"password": "*****"
})
headers = {
'Content-Type': 'application/json'
}
response = requests.request("POST", url, headers=headers, data=payload)
#*** Convert response into a dictionary ***
r = json.loads(response.text)
# *** print the value of they key 'accessToken'
bearerToken = r['accessToken']
print(bearerToken)
Output
{'accessToken': 'e************************************', 'tokenType': 'Bearer'}
What am I trying to achieve?
Grab only the censored code after 'accessToken' and store the new Access Token in a string to use it in HTTP requests.
Note: 'accessToken' is a value of another key called accessToken. So the traditional method of printing the value of the key has already been used in the output shown above.
Complete output:
{
"accessToken" : {
"accessToken" : "e******************",
"tokenType" : "Bearer"
},
"refreshToken" : {
"id" : "6*************",
"lastAccessedTime" : 1***********,
"refreshToken" : "e*************"
}
}

Answer 1

In Python, you can use substrings to accomplish what you want. If the length of the prefix is constant, then all you would need to do is use a slice with constant index,
In your example, it looks like you have an accessToken key, and inside that key is another dictionary holding a key that can change between entries. Assuming that you want the censored portion after e in accessToken, you can access that using:
bearerToken = r['accessToken'][accessToken][1:]
This will give you the access token "******************", which is everything from index 1 onwards. If you just want the entire string, you can omit the [1:] portion.

Answer 2

The solution was to edit the code provided by yeeshue99, the 2nd value to 'accessToken' with the '' marks. the [1:] was also not needed.
Solution
bearerToken = r['accessToken']['accessToken']