TypeError: AsyncSubstrateInterface.get_block_number() missing 1 required positional argument: 'block_hash'

[FLiotta]

Describe the bug

Hello, I'm currently implementing Bittensor and ran with the TypeError specified in the title:

TypeError: AsyncSubstrateInterface.get_block_number() missing 1 required positional argument: 'block_hash'

To Reproduce

1. Install bittensor sdk on your python project
2. Run the next snippet

import asyncio
import bittensor

async def main():
    subtensor = bittensor.async_subtensor()
    current_block = await subtensor.get_current_block()

    print(current_block)

if __name__ == "__main__":
    asyncio.run(main())

3. Error happens

File "/project/sandbox.py", line 6, in main
current_block = await subtensor.get_current_block()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/project/.venv/lib/python3.12/site-packages/bittensor/core/async_subtensor.py", line 239, in get_current_block
return await self.substrate.get_block_number()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: AsyncSubstrateInterface.get_block_number() missing 1 required positional argument: 'block_hash'

Expected behavior

As the get_current_block method indicates, I need to access the current block number in the Bittensor blockchain.

I expect to call to the get_current_block method at the AsyncSubtensor class, and receive a number (block_number) in return.

Screenshots

No response

Environment

Mac OS 14.6.1

Additional context

This is happening because AsyncSubtensor.get_current_block calls AsyncSubstrateInterface.get_block_number without any parameters. Since this method expects an optional parameter (block_hash: Optional[str]), it raises a TypeError because no default value of None is given.

[thewhaleking]

Resolved by #2529