It searches for all events:

1. Which have been emitted by the designated ERC20 token contract, which in your case is:

To: Contract 0xc73e0383f3aff3215e6f04b0331d58cecf0ab849

2. Whose first topic (topics[0]) is equal to the hash of the signature of the Transfer event:

In Javascript, this value is Web3.utils.keccak256("Transfer(address,address,uint256)")

You may use the equivalent code in Python if you need to...

It searches for all events:

1. Which have been emitted by the designated ERC20 token contract, which in your case is:

To: Contract 0xc73e0383f3aff3215e6f04b0331d58cecf0ab849

This value should appear in the to field of the transaction receipt

2. Whose first topic (topics[0]) is equal to the hash of the signature of the Transfer event:

In Javascript, this value is Web3.utils.keccak256("Transfer(address,address,uint256)")

You may use the equivalent code in Python if you need to...