# Assuming the following algorithm is in KeySigningHandler.py in the same directory
import requests
from ActivityHandler import *

# URL pointing to your actor object
actor_id = "https://noah.netlify.app/noah/actor.json"

# Path to the private key generated using the "Webfinger for Discovery Post" algorithm
private_key_path = "..."

# Webfinger of the user you want to follow
webfinger = "@alice@mastodon.social"

# Activity Information
# Store the post ID uniquely; in this case, it's the URL of the post
post_id = "https://noah.netlify.app/posts/comments/first"
reply_post_id = "..."
content = "example content"

# Flag indicating whether the post is public or private
public = True

handler = ActivityHandler(actor_id, private_key_path)
handler.send_reply_activity(
    post_id=post_id,
    reply_post_id=reply_post_id,
    content=content,
)

{
    "@context": "https://www.w3.org/ns/activitystreams",
    "type": "Create",
    "id": "{ID_OF_YOUR_POST}", 
    "actor": "{YOUR_ACTOR_OBJECT_URL}", 
    "object": {
        "id": "{ID_OF_YOUR_POST}",
        "type": "Note",
        "attributedTo": "{YOUR_ACTOR_OBJECT_URL}",
        "content": "{CONTENT}",
        "inReplyTo": "{REPLY_POST_ID}",
        "to": [ 
            "{YOUR_ACTOR_FOLLOWERS_URL}",
        ],
        "cc": [ "{YOUR_ACTOR_FOLLOWERS_URL}" ]
    },
    "published": "...",
    "to": [ 
        "{YOUR_ACTOR_FOLLOWERS_URL}",
    ],
    "cc": [ "{YOUR_ACTOR_FOLLOWERS_URL}" ]
}