Python 3.5.2 Iterating a get request - python-3.x

Question

Hoping someone can tell me whether this script is functioning the way I intended it to, and if not explain what I am doing wrong.
The RESTful API I am using has a parameter pageSize ranging from 10-50. I used pageSize=50. There was another parameter that I did not use called pageNumber
So, I thought this would be the right way to make the get request:
# Python 3.5.2
import requests
r = requests.get(url, stream=True)
with open("file.txt",'w', newline='', encoding='utf-8') as fd:
text_out = r.text
fd.write(text_out)
UPDATE
I think I understand a bit better. I read the documentation in more detail, but I am still missing how to get the entire data set from the API. Here is some more information:
verbs = requests.options(r.url)
print(verbs.headers)
{'Server': 'ninx', 'Date': 'Sat, 24 Dec 2016 22:50:13 GMT',
'Allow': 'OPTIONS,HEAD,GET', 'Content-Length': '0', 'Connection': 'keep-alive'}
print(r.headers)
{'Transfer-Encoding': 'chunked', 'Vary': 'Accept-Encoding',
'X-Entity-Count': '50', 'Connection': 'keep-alive',
'Content-Encoding': 'gzip', 'Date': 'Sat, 24 Dec 2016 23:59:07 GMT',
'Server': 'ninx', 'Content-Type': 'application/json; charset=UTF-8'}
Should I create a session and use the previously unused pageNumber parameter to create a new url until the 'X-Entity-Count' is zero? Or, is there a better way?

Answer 1

I found a discussion that helped clear this matter up for me...this updated question should probably be deleted...
API pagination best practices