How to get arguments in Smart Contract using PYTEAL

[cotunho]

Hi everybody,
this is my first approach to TEAL and Smart Contracts, that’s why I’m using PYTEAL to generate TEAL file and so I have some questions.

1. According to pyteal documentation’s examples (here: PyTeal Examples — PyTeal documentation), I’m trying to put my arguments from my python program to my smart contract using this call:
   txn = transaction.ApplicationOptInTxn(sender, params, index, app_args=args)
   Isn’t it correct? How can I pass my args to Smart Contract? And how can I get it inside Smart Contract?

2. I need to create some asset (linked to an Algorand account) in Smart Contract. Is it possibile? If yes, how can I do it?

Thank you for your help!

[fabrice]

1. To pass arguments, see Using the SDKs - Algorand Developer Portal (this also works with OptIn transactions, but the example is for a call transaction). To read arguments from the smart contract, see e.g., pyteal/vote.py at 3fe0c94203e56d7e67dc44607afa0fa9fb0bbb54 · algorand/pyteal · GitHub
2. A stateful smart contract / application cannot issue transaction by itself. But a call to an application can be grouped with other transactions, potentially from stateless smart contracts. Using this pattern, you can easily (indirectly) create assets from a stateful smart contract. Note that assets themselves on Algorand do not require smart contracts to be created.