Upgrade web3py to v7

[YoshihitoAso]

Upgrade web3 python to v7 beta.

Ref: Migration guide

• https://web3py.readthedocs.io/en/v7.0.0-beta.6/migration.html#migrating-from-v6-to-v7

1. hex() -> to_0x_hex()

Doc: None(?)

The return value of the function changes as follows:

• v6

  >>> hex_test = HexBytes("0x")
  >>> hex_test.hex()
  '0x'

• v7

  >>> hex_test = HexBytes("0x")
  >>> hex_test.hex()
  ''
  >>> hex_test.to_0x_hex()
  '0x'

2. (get_logs) fromBlock -> from_block, toBlock -> to_block

The parameter names of get_logs is changed.

• fromBlock -> from_block
• toBlock -> to_block.

Doc: https://web3py.readthedocs.io/en/v7.0.0-beta.6/migration.html#remaining-camelcase-snake-case-updates

3. geth_poa_middleware, async_geth_poa_middleware -> ExtraDataToPOAMiddleware

Doc: https://web3py.readthedocs.io/en/v7.0.0-beta.6/migration.html#middleware-renaming-and-removals

4. The way to implement CustomMiddleware has changed

Implementation changes

Doc: https://web3py.readthedocs.io/en/v7.0.0-beta.6/middleware.html#creating-custom-middleware

5. Performance improvement

In v6, there is an issue where unnecessary memory space is allocated when importing ABIEventFunctionNotFound. Upgrading to v7 will resolve this issue.

• https://github.com/ethereum/web3.py/commit/e24363e8eaafcf82931c4cbbc6af8c93a6519fe1

v6: indexer_Transfer.py

v7: indexer_Transfer.py

6. Misc

• Since v7 is currently in beta, I made sure to pin the installation version via poetry.