You can take a look at the migrator cheatcodes tests (v0.4.2).
https://github.com/software-mansion/protostar/tree/53cb5dc5cda1a74a1ffb862d84e7035e44a5c56b/tests/integration/migrator

(Migration scripts are intended to be used with proxy pattern.) 

_This answer was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Newton

is there an example of migration scripts somewhere ?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is there an example of migration scripts somewhere [Cairo/StarkNet]?

I'm aware of starknet having a common--and unsafe--keccak library. Either way, I was wondering if there's a way to mimic the behavior of solidity's 
```
keccak256(abi.encode(parameters))
```
Thank you very much.

Is there a Cairo equivalent to Keccak256(abi.encode(parameters))?

Hi. I am seeing this error in my tests after upgrade.

```
(starknet-py) JediSwap % protostar test tests/test_deployment.cairo 
17:59:05 [INFO] Collected 1 suite, and 3 test cases (0.062 s)                                                                                                    
[UNEXPECTED_EXCEPTION] tests/test_deployment.cairo                                                                                                               
Traceback (most recent call last):
  File "protostar/commands/test/test_runner.py", line 98, in run_test_suite
  File "protostar/commands/test/test_runner.py", line 155, in _build_execution_state
  File "protostar/commands/test/environments/setup_execution_environment.py", line 38, in execute
  File "protostar/starknet/execution_environment.py", line 32, in perform_execute
  File "starkware/starknet/testing/contract.py", line 293, in execute
  File "starkware/starknet/testing/contract.py", line 303, in _execute_on_given_state
  File "protostar/starknet/cheatable_state.py", line 97, in execute_entry_point_raw
  File "starkware/starknet/testing/state.py", line 241, in add_messages_and_events
  File "starkware/starknet/business_logic/execution/objects.py", line 337, in get_sorted_events
IndexError: list assignment index out of range
```

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

StarkNet error while deploying: IndexError: list assignment index out of range. Can anyone help?

How can I interact with my contract on Starknet using starknetjs?

How do I use keccak functions in Cairo? I am getting the error `Unknown identifier 'bitwise_ptr'` 


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/662)_

Cairo error: Unknown identifier 'bitwise_ptr' when using keccak

Hello guys, I would like to know if CAIRO work in python3.10 venv? Because I have a problem to install python 3.9.


_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Does Cairo work in python3.10 venv? I can’t install python 3.9

I try to execute a code with `get_balance_sync` method:
![get_balance_sync Cairo StarknetPy code sample](https://res.cloudinary.com/varga/image/upload/c_pad,b_auto:predominant,fl_preserve_transparency/v1670921600/code_image_spbt0g.jpg)

However, I got this error:

```
starknet_py.net.client_errors.ClientError: Client failed with code 500: {"code": "StarknetErrorCode.ENTRY_POINT_NOT_FOUND_IN_CONTRACT", "message": "Error at pc=0:10:\nGot an exception while executing a hint.\nCairo traceback (most recent call last):\nUnknown location (pc=0:228)\nUnknown location (pc=0:214)\n\nError in the called contract (0x7f81ea93daf9c49494e3131b95646c3a8df5d97d151cc6484d49eaebe3e3d0a):\nEntry point 0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e not found in contract with class hash 0x3ae692aaf1ded26a0b58cf42490f757563850acea887ed57b4894fee8279063."}
```

Can you help me to resolve this?

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Is there an example of migration scripts somewhere [Cairo/StarkNet]?

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