Question, why [input_token, weth, output_token] #405

Hello not a bug, but however a question from a newbie in dex swapping.

There on line 1011:
[input_token, self.get_weth_address(), output_token],

why are the default for v2 a 3 way path, I debugged the code yesterday, because I already had some WETH in my meta account, so naturally I set the input to weth, and output to what I wanted to swap i for, which kept failing with "SAME ADDRESS" error.

Are there any perks of using a 3-way route over a 2-way route on Uniswap V2, in my own clumsy and logic (VERY new to defi) it should be faster and cheaper with a 2-way router rather than a 3-way route, right?

Can someone explain the implementation reason to me, as I cant find it in the documentation and neither that it defaults to weth as middle route, perhaps i just used it wrong.... but it would be great to get some perspective on the matter

uniswap = Uniswap(address=address, default_slippage=0.5, private_key=private_key, version=version, provider=provider)

web3 = Web3(Web3.HTTPProvider(mainnet_url))
token_meta = uniswap.get_token(token, 'erc20')
spend_eth = '0.001'
spend = web3.to_wei(spend_eth, 'ether')
Amount = uniswap.get_price_input(WETH_PAIR_ADDRESS, token, spend)
uniswap.make_trade(WETH_PAIR_ADDRESS, token, spend, fee_on_transfer=True)