Clarity on Docker Container IP addresses for API requests

I want to be able to connect to a third-party .NET API I am running as a docker image within a container. When I connect to the ip address and port on my browser it works though when I try and run a get request in python it does not. I am not sure what I am doing wrong.

The Django python application is an image within the container using 0.0.0.0:8000.

This is the docker-compose.yml file for a .NET image I am running from within a container:

mt4rest:
    image: mt4rest:latest
    ports:
      - "0.0.0.0:5000:80"

Here are the ports as per docker inspect

  "Ports": {
                "443/tcp": null,
                "80/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "5000"
                    }
                ]
            },

When I run

http://0.0.0.0:5000/Ping

or

http://127.0.0.1:5000/Ping

in my browser, I get OK though when I run the same endpoints in Python:

response = requests.get('http://0.0.0.0:5000/Ping')

or

response = requests.get('http://127.0.0.1:5000/Ping')

I receive the following error:

requests.exceptions.ConnectionError: HTTPConnectionPool(host='0.0.0.0', port=5000):
Max retries exceeded with url: /Ping (Caused by
NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fe7aa5af640>: 
Failed to establish a new connection: [Errno 111] Connection refused'))

or

requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=5000): 
Max retries exceeded with url: /Ping (Caused by 
NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6322e2b640>: 
Failed to establish a new connection: [Errno 111] Connection refused'))

I understand this to mean that the address for the request is not found.

I am not sure what I am doing wrong.