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I'm interacting with my local private blockchain created using geth. I'm able to use eth_call, but now I have some problems with eth_sendTransaction.

The signature of the function is this: 

function addContract(bytes32,address)

So in python I do:

addContract = sha3hex8('addContract(bytes32,address)')

sha3hex8 is a function I've created that I'm sure works correctly because I use it for all the eth_call I've done. Then I need to add the two parameters.

How can I attach the two parameters with the right encoding? Should I simply concatenate at the end the address parameter without the starting 0x?

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