ethereum/web3.py

Bryant Eisenbach

@fubuloubu

*URL

Looks like a lot of good ethPM features going in? 👀 @njgheorgita

Nick Gheorghita

@njgheorghita

hmm - maybe? haven’t added a whole lot there since migrating the codebase over from the original py-ethpm repo (like v5.0b4-ish) - most of the recent actions been over in the cli

kclowes

@kclowes

P.S. leave a space between the URP and the !

ha oops

Ben Hauser

@iamdefinitelyahuman

does anyone know of a python equivalent to https://github.com/maxme/abi2solidity ?

Mikko Ohtamaa

@miohtama

@iamdefinitelyahuman it is a very specialised piece of code. I would just call it as a subprocess if possible. I guess NPM dependencies are the headache?

Ben Hauser

@iamdefinitelyahuman

yeah i'd rather build my own implementation than have to deal with NPM in a python package hahaha

didn't wanna reinvent the wheel if someone else has already done it tho

Mikko Ohtamaa

@miohtama

@iamdefinitelyahuman I would use Jinja or similar template language and just directly feed ABI file in the template

Ben Hauser

@iamdefinitelyahuman

ahh nice, good idea

Mikko Ohtamaa

@miohtama

Jinja is very easy to adapt, here are some examples: https://github.com/websauna/websauna/blob/master/docs/generate-sitemap.py#L1

kclowes

@kclowes

web3 v5.2.0 is out! https://web3py.readthedocs.io/en/stable/releases.html

Muhammad Yasir

@SyedMuhamadYasir

any examples of using etherscan with python ?

i can't find any example code anywhere :/

Noel Maersk

@veox

@SyedMuhamadYasir AFAIK etherscan does not provide web3 APIs. You can try https://github.com/corpetty/py-etherscan-api instead.

Muhammad Yasir

@SyedMuhamadYasir

@veox thanks for the suggestion, but i have already seen that repo

it does not support rinkeby network, which is what i'm operating on right now

i don't think i necessarily need a web3 api

i just need to know how to use the etherscan API in python

back to the basics kinda thing

Ben Hauser

@iamdefinitelyahuman

for basic API calls just use the requests package probably?

Muhammad Yasir

@SyedMuhamadYasir

so... any tutorials relevant to this ?

Ben Hauser

@iamdefinitelyahuman

@miohtama https://github.com/iamdefinitelyahuman/abi2solc

Mikko Ohtamaa

@miohtama

@iamdefinitelyahuman Somebody has been busy!

that is some hardcore string concatenation :)

Eric

@efalken

I'm running the same python/web3 program on Windows as in Linux. However, in Windows I get an error on my getTransactionReceipt function

signed_txn = w3.eth.account.signTransaction(txn_dict, private_key=cfg.wallet_private_key)
result = w3.eth.sendRawTransaction(signed_txn.rawTransaction)
tx_receipt = w3.eth.getTransactionReceipt(result)

error:

File "C:\Users\Eric\AppData\Local\Programs\Python\Python37\lib\site-packages\web3\eth.py", line 274, in getTransactionReceipt
raise TransactionNotFound(f"Transaction with hash: {transaction_hash} not found.")
web3.exceptions.TransactionNotFound: Transaction with hash: b'\xca\xea`\xb3\xbe.D\xb0\x0c\xfe\xc0\xae\x029\xe5l[e\x038?\xea\x94)7\x1f\x951*\x99\x03O' not found.

It seems my windows Python (3.7) is doing something different with the hash than the Linux version (3.6). Any thoughts?

Eric

@efalken

It is the exact same program, accounts, etc. (running on Ropsten)

Jason Carver

@carver

You probably want waitForTransactionReceipt. If the transaction is not mined right away, you could get that result.

I see that transaction was just added 1hr 10 min ago, which isn't too long before your message: https://ropsten.etherscan.io/tx/0xcaea60b3be2e44b00cfec0ae0239e56c5b6503383fea9429371f95312a99034f

Eric

@efalken

Is this because Windows is slower than Linux?

Eric

@efalken

So I would just do this:

signed_txn = w3.eth.account.signTransaction(txn_dict, private_key=cfg.wallet_private_key)
result = w3.eth.sendRawTransaction(signed_txn.rawTransaction)
w3.eth.waitForTransactionReceipt(signed_txn.rawTransaction) # new line
tx_receipt = w3.eth.getTransactionReceipt(result)

Jason Carver

@carver

Maybe. TransactionNotFound is a normal kind of response to getTransactionReceipt() though, so you need to either catch it explicitly, or switch to waitForTransactionReceipt().

signed_txn = w3.eth.account.signTransaction(txn_dict, private_key=cfg.wallet_private_key)
result = w3.eth.sendRawTransaction(signed_txn.rawTransaction)
tx_receipt = w3.eth.waitForTransactionReceipt(result) # replace line

It takes the transaction hash, and returns the receipt, just like getTransactionReceipt()

Eric

@efalken

oh...it's the same thing, with a built-in wait mechanism. That's cool. I saw some code that had 20 lines to deal with this...

Jason Carver

@carver

:+1:

Eric

@efalken

Thanks

Jason Carver

@carver

Happy to help!

Eric

@efalken

@carver actually, I don't think it's Windows so much as linux was on a server, while Windows was on a desktop in a goofy business network not focusing on latency

Jason Carver

@carver

eth-tester with istanbul support is out: v0.2.0-beta.3

kclowes

@kclowes

:tada:

arjuna sky kok

@arjunaskykok_gitlab

Thanks to @carver 's work, finally I could upgrade Mamba to use Web3.py version 5. Now Mamba version 0.3.0 with Web3.py version 5.2 has been released. pip install black-mamba and BUIDL something cool! https://mamba.black

Jason Carver

@carver

I have only been dabbling in web3 lately. Are you sure you didn't mean someone else like @kclowes ? :)

arjuna sky kok

@arjunaskykok_gitlab

Yeah, actually I should thank everyone. But your specific commit (ethereum/eth-tester@3ffa12b) solved my problem (could not upgrade to web3.py v5). :)

Jason Carver

@carver

Oh haha, glad to hear it :)

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