Listening to Uniswap contract events using web3.py and infura.io

Here is rough guide

1. Get ABI for Uniswap contract

2. Create a web3.py contract object

3. You can use web3.eth.getLogs() to query events over past block range

4. You cannot query all events once, because there are so many events and Infura would time out. Instead you need to query events carefully over a block range slices.

Here is some old code which may or may not work with the latest web3.py versions

https://github.com/TokenMarketNet/sto/blob/master/sto/ethereum/scanner.py#L153

If you want a real time scanner you can listed to events over a WebSocket connection as they happen:

https://web3py.readthedocs.io/en/stable/filters.html#asynchronous-filter-polling