How to upload attachment to an Issue using the REST API in Python??

Please, run the following in Python:

# ===============
# greeting.txt
# ===============
hello, world
 
# ===============
# upload.attachment.py
# ===============
import requests
import json


# [JIRA-BASE-URL], i.e.: http://localhost:8080
# [ISSUE-ID], i.e.: ATT-1
url = '[JIRA-BASE-URL]/rest/api/2/issue/[ISSUE-ID]/attachments'
headers = {"X-Atlassian-Token": "nocheck"}
# please uncomment to attach external file
files = {'file': open('greeting.txt', 'rb')}


# upload file to issue
# [USERNAME], i.e.: admin
# [PASSWORD], i.e.: admin
r = requests.post(url, auth=('[USERNAME]', '[PASSWORD]'), files=files, headers=headers)
print(r.status_code)
print(r.text)

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Thank you for your understanding.