fix asyncweb3

[wakamex]

use middleware or middlewares argument as appropriate for the Web3py version

fixes: #110

[DefiDebauchery]

This depends on what version of web3py that @BobTheBuidler wants to target. The middlewares kwarg was changed in 7.0 and there are a number of people still using v6.

I would like to see some modernization of this library for Python itself, but web3py v7 has introduced a lot of changes throughout that people may not be prepared to upgrade.

[wakamex]

you're quick! what do you think about this?

# AsyncWeb3 switched to middleware instead of middlewares
# check if AsyncWeb3 has a middleware parameter
if hasattr(AsyncWeb3, "middleware"):
    async_w3 = AsyncWeb3(provider=provider, middleware=middlewares)
else:
    async_w3 = AsyncWeb3(provider=provider, middlewares=middlewares)

[BobTheBuidler]

Just specify in the docstring which web3py version(s) the change is for and then I'll merge. Thanks for this!

[wakamex]

source for the change being v7.0.0-beta.2 (2024-03-11): https://web3py.readthedocs.io/en/stable/release_notes.html

[wakamex]

if you're willing to bump the minimum web3py dependency to v7.0.0-beta.2 (or higher) then you can remove some of the AsyncWeb3 workarounds I think, like this one that does the if AsyncWeb3 check #102

[BobTheBuidler]

I prefer to keep the deps as loose as possible here and leave that choice to the user. The above workaround is fine, this code does not run in tight loops as it is so efficiency isn't a huge deal.

[Richymaestro]

Is it possible to still merge this PR, with maybe only the first two commits? Still the multicall is not working when using web3py >7

[Richymaestro]

In fact maybe its better to try/except?
if AsyncWeb3:
try:
# Try using 'middleware' (newer versions)
async_w3 = AsyncWeb3(provider=provider, middleware=[])
except TypeError:
# Fallback to 'middlewares' (older versions)
async_w3 = AsyncWeb3(provider=provider, middlewares=[])
else:
try:
# Try using 'middleware' (newer versions)
async_w3 = Web3(provider=provider, middleware=[])
except TypeError:
async_w3 = Web3(provider=provider, middlewares=[])
async_w3.eth = AsyncEth(async_w3)`

[BobTheBuidler]

Not a try, except, but we should basically encapsulate this same logic in an `if` check which checks the package version of web3.py Happy to review and merge it if you put it together

…

On Wed, Aug 6, 2025 at 8:27 AM Richymaestro ***@***.***> wrote: *Richymaestro* left a comment (banteg/multicall.py#112) <#112 (comment)> In fact maybe its better to try/except? if AsyncWeb3: try: # Try using 'middleware' (newer versions) async_w3 = AsyncWeb3(provider=provider, middleware=[]) except TypeError: # Fallback to 'middlewares' (older versions) async_w3 = AsyncWeb3(provider=provider, middlewares=[]) else: try: # Try using 'middleware' (newer versions) async_w3 = Web3(provider=provider, middleware=[]) except TypeError: async_w3 = Web3(provider=provider, middlewares=[]) async_w3.eth = AsyncEth(async_w3) — Reply to this email directly, view it on GitHub <#112 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQ3HIHV7ME427O3QF6HQEJT3MHYBPAVCNFSM6AAAAABZSKQZZWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTCNJZHE3DAMBXHE> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[Richymaestro]

@BobTheBuidler #163 added it here, let me know what you think