Web3.py and smart contract on ETH

I'm basically traying to understand how the ethereum blockchain works and how to send tx using python coding. But still there are many peaces that I can't understand.

Can I send transactions using just web3.py library or it is necessary to create an smart contract with solidity to send the tx?

Does web3.py library create an underlying smart contract when you seend the tx?

Which instructions do I need to send a swap to a LP?

If anyone have appropiate answers for this questions, I would appreciate.

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Thaks in advance!!