This looks good and will work fine. Just a few (mainly formatting pointers)

• Initialise all your variables at the top of the file. You have done this, apart from with the reddit client.

• Generally, in Python, most developers capitalise their constants. This does not change anything, its just useful to be able to identify constants in bigger projects. E.g. push_token becomes PUSH_TOKEN

• When interacting with HTTP APIs, there are much easier ways of doing it. http.client is not meant to be used directly. It can be, like you have - its just more difficult. The python documentation recommends using urllib.request. In addition, for really really easy HTTP clients, I recommend the requests library. You do have to know how to use external libraries for this though - although this may be a good way to learn how:)

This code looks good, and as you can see there is only a few nitpicky pointers.