Error adding a key value pair to the dictionary of artists

Question

The API of the Artsy project provides information about some artists, their works, exhibitions.

I'm trying to make a get request to all artists by their id from a file dataset_24476_4.txt

Example of a string from a file

4d8b92a44eb68a1b2c000328

An example of the answer can be found at the link

The python interpreter throws the error name = r['name'] KeyError: 'name', but print(r["name"]) works correctly

# -*- coding: utf-8 -*- 
import requests

client_id = '---'
client_secret = '---'

r = requests.post("https://api.artsy.net/api/tokens/xapp_token",
    data = {
        "client_id": client_id,
        "client_secret": client_secret
    }
).json()

token = r["token"]

headers = {
    "X-Xapp-Token" : token
}

artists = {}

# test get request 
r = requests.get(
    f"https://api.artsy.net/api/artists/4d8b92b34eb68a1b2c0003f4", 
    headers=headers
).json()

print(r)

with open('dataset_24476_4.txt') as file:
    for num in file:
        num = num[:-1]
        
        r = requests.get(
            f"https://api.artsy.net/api/artists/{num}", 
            headers=headers
        ).json()
        
        name = r['name']
        birthday = r['birthday']
        print(name, birthday)
        
        artists.update({ 
            name : birthday,
        })

print(sorted(
    artists.items(), 
    key=lambda x: (
        x[1], 
        x[0]
    )
))