Questions tagged [pyethereum]
Ethereum's core Python library implementation
69
questions
14
votes
1
answer
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views
Whats the difference between pyethapp and pyethereum?
This one:
https://github.com/ethereum/pyethapp
and this one:
https://github.com/ethereum/pyethereum
I have pyethapp running (the ipython console). What then is pyethereum?
- 1,953
11
votes
1
answer
2k
views
How to connect an Android App user to ethereum network?
I'm working on developing a decentralized application which requires every user of the Android app to have separate account containing his ether balance information and other user-specific information....
- 213
8
votes
3
answers
6k
views
Fastest way to send transactions
I'm currently performing my Ethereum logic using pyethereum and then sending transactions via a remote node using https://infura.io/. It's not fast enough for my needs. What can I do to ensure my ...
- 640
6
votes
2
answers
1k
views
How can I change the gas price or the gas limit when testing with pyethereum?
I've got some code that's ultimately destined to run on a private network. I'm testing it with the lovely pyethereum, doing things like:
from ethereum import tester as t
class testMyContract(...
- 16.9k
6
votes
1
answer
8k
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Verifying personal.sign signature with pyethereum
I'm trying to verify a signed message from Metamask with pyethereum. I can not seem to recover the correct address from the signature. Lack of documentation isn't helping matters.
On the client ...
- 1,212
6
votes
2
answers
3k
views
pyethapp dependence secp256k1 install failed on OS X
Was trying to install pyethapp since want to work with ETH from python. But cant install secp256k1 dependence no matter what I tried.
I'm using OS X 10.11.4 and Python 2.7.10 (tried 3.5.1 as well)
...
- 473
6
votes
2
answers
7k
views
How to apply pyethrecover.py on v3 .json/transfor v3 .json to .v1
I'm trying to get pyethrecover.py running via Python on one of my .json files that were created by Ethereum-wallet for Mac. It seems that my .json file is v3 and the pyethrecover.py only works for v1 ...
- 61
6
votes
1
answer
285
views
Generating accounts with pyethereum is insanely slow
I'm trying to debug an app that at some point needs to create a password
protected account. When I reach that point in my code using pycharm's debugger it takes forever to generate an account ...
- 5,294
5
votes
3
answers
9k
views
Are there any implementations of smart contracts in Python?
I want to implement some smart contracts and I am strongest in python.
- 159
5
votes
2
answers
703
views
Calling specific functions within a contract using pyethereum
I've been going through this tutorial and got to the part where the contract is being sent to the block chain:
pyethtool applytx $genesis $tx
which should give the output:
{“result”: “...
- 5,294
5
votes
2
answers
2k
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(Python) eth_getFilterChanges --> data --> how to decode?
Edit: solved, scroll down.
How to decode filter results?
A contract is emitting this Event
event Send(address from, address to, uint value)
With ethjsonrpc and its eth_getFilterChanges I am ...
- 354
5
votes
4
answers
788
views
Why do you want to use different implementations of EVM?
Currently there are many implementations of EVM (Java, C++, Python, Go, etc).
For example: I will be using Solidity to write DApp on the top of EVM-Java and EVM-Python, why would I want to use EVM-...
- 471
5
votes
3
answers
1k
views
pyethapp ImportError: cannot import name blocks
I installed pyethapp using pip install -c constraints.txt pyethapp. The constraints.txt file has one line, pyelliptic==1.5.7, to prevent the install error mentioned in this thread. The install ...
- 151
5
votes
1
answer
121
views
Running an external command upon transaction confirmation
I was wondering if it were possible to launch an external command (system call) when a transaction sent by a node is confirmed?
For example if node A runs pyethapp (in the context of a private ...
- 5,294
5
votes
0
answers
153
views
Error creating Transaction with pyethereum: Can only serialize integers [closed]
I'm following the instructions found here to create an offline Transaction. When executing, the following line, I get "Can only serialize integers" exception raised by rlp. I did import pdb;pdb.pm() ...
- 51
4
votes
2
answers
867
views
How open local ethereum chain (leveldb) using PyEthereum package?
I got local private blockchain in:
/Users/User/EthereumTestNet/geth/chaindata
How i can connect to it, to get chain data by ethereum.pow.chain.get_block(hash)?
I know that to look at chain data i ...
- 317
4
votes
1
answer
2k
views
Storing data in the blockchain inside a transaction
This question is related to this one and this one. I'm trying to store data in the blockchain inside the transaction data field:
The second question offers a solution using a contract but is it ...
- 5,294
4
votes
1
answer
588
views
What Sequence Occurs 'Under the Hood' When an Ethereum Contract Function is Called?
It seems when a single function is called, the Ethereum Virtual Machine:
Does 'pre-call checks' for exceptions/errors.
Computes the amount of gas needed, checks that the accounts involved exist.
...
- 241
4
votes
1
answer
2k
views
Scraping ethereum blockchain in human readable format (csv)
I wanted to scrape the whole ethereum blockchain in csv format. For this I reverse engineered and extended this code by vitalik: https://github.com/ethereum/research/blob/master/uncle_regressions/...
- 333
4
votes
1
answer
782
views
How to use the hashimoto light algorithm in pyethash?
I have a problem with using the hashimoto light algorithm in pyethash.
I am using pyethash version 23.1 and comparing the results with ethash.run (ethashjs 0.0.7).
Using the same inputs the result ...
- 1,943
3
votes
2
answers
1k
views
RLP encoding of 0
According to the docs here,
For a single byte whose value is in the [0x00, 0x7f] range, that byte
is its own RLP encoding
I ran the following using pyrlp (similar to the code in pyethereum here):...
- 896
3
votes
3
answers
1k
views
How to sync pyethapp (python ethereum client) with the mainnet?
I just installed pyethapp. However, I'm unable to sync the blockchain. Here is what I get when I run the client:
0 ✓ user@host ~ $ pyethapp run
Failed to import scrypt. This is not a fatal error but ...
- 32.9k
3
votes
3
answers
4k
views
populus OSError: [Errno 2] No such file or directory
When trying:
$populus compile
Get:
OSError: [Errno 2] No such file or directory
Tried:
Tried to install missing dependencies as described here and installed solidity compiler as well - same ...
- 1,760
3
votes
1
answer
4k
views
How to send a transaction to myetherapi.com with Web3.py
I am having trouble interacting with myetherapi.com using web3.py. I am able to create a few functions that were working, like get_eth_balance() below. But to send transactions like send_eth(), I just ...
- 31
3
votes
2
answers
2k
views
How to generate a raw transaction with data using Pyethereum
How do you use Pyethereum to generate a raw tx to send to the blockchain? I can do it successfully with a transaction with no data, but when I am attempting to use data, it does not function properly.
...
- 327
3
votes
1
answer
264
views
TestRPC - Pythereum - No handlers could be found for logger "jsonrpc.manager"
I am trying to get the standard init tests to work but I am getting the subject error. could you please help me to resolve this.
Thanks,
TestRPC/0.8.7/linux2/python2.7.12
Available Accounts
...
- 95
3
votes
1
answer
5k
views
serializing byte array for transaction data
I've upgraded from python 2 to python 3 and some code that used to work is now broken. I can't seem to fix it. Any suggestions?
Worked in python 2
# Convert hex string to byte array
hex_string = ...
3
votes
1
answer
928
views
How can a raw transaction be generated with pyethereum library?
Is it possible to generate a raw transaction using pyethereum library taking inputs wallet json, password, along with transaction parameters?
My attempt below, I get the hex, when inputting hex into ...
- 33
3
votes
0
answers
368
views
Send JSON RPC request in BATCH
Is there any way i can send rpc request in batch way using pyethapp? If exists, whether it can help to increase the request efficiency?
Thanks a lot.
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3
votes
0
answers
68
views
Effectively debugging pyethapp
I have also asked the technical details of pyethapp's use of gevents here.
I'm trying to run a transaction step by step in a debugger and see how it is being signed and added to the blockchain. I am ...
- 5,294
3
votes
0
answers
698
views
Pyethapp Build error: No files/directories in ..pip-build-gpzcs1\leveldb\pip-egg-info (fr om PKG-INFO)
I'm new to ethereum & do not have any ethereum clients 'installed'.
I'm trying to install pyethapp in a clean virtualenv following the github tutorial, but it produces the following error.
...
- 31
2
votes
1
answer
1k
views
What is pyethereum?
I have seen a definition here saying: "This is the Python core library of the Ethereum project"
So what is it's use? To develop dapps using python on the ethereum network?
- 1,843
2
votes
1
answer
263
views
any detailed documents about ethjsonrpc
I want to develop a Python based client that can make use of the Ethereum network, a possible way to do it is using ethjsonrpc module, but is there any detailed documents about ethjsonrpc?
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2
votes
0
answers
812
views
How to initiate ethereum transaction in HD wallets using python?
I've managed to generate HD wallet for ethereum where I have Master Key, xpriv, xpub (156 in lengh) keys but for signing a transaction I need private key of address(64 Characters).
How could we ...
2
votes
0
answers
136
views
Pyethapp stuck on waiting for bootstrap
I am trying to build a distributed application using pyethapp.But I am facing difficulty in setting up pyethapp.
2
votes
0
answers
54
views
Sharing live chaindata across processes
I'm running a node with geth, and would like to operate on the live chaindata using pyethereum. Is there a clever way to get around the lock imposed by LevelDB? Thanks!
- 37
2
votes
0
answers
303
views
pyethrecover v3 need help
I have lost my mist wallet password (1 year ago)
i tried pyethrecover but... no error , no luck... i guess because i have mist .089 keysotre file... so i tried this one:
How to apply pyethrecover.py ...
- 21
2
votes
0
answers
153
views
pretty_compile in pyethereum
I am learning Serpent with pyethereum in Spyder (so I have a running log of what I have tried and learned), but I am stuck in translating standard features of Serpent (such as pretty_compile) from ...
- 51
2
votes
0
answers
76
views
Debugging pyethapp
I'm having some trouble debugging pyethapp. I have also asked a question here. I get an error in file console_service.py at line 38 (as of version pyethapp 1.2.2/linux2/py2.7.9):
@inputhook_manager....
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1
vote
1
answer
10k
views
How can I generate a wallet in python?
Im trying to write a python script that can generate a new wallet for that user, but I need to be able to keep the private key.
I followed this : Stack overflow answer
And got these results:
import ...
- 113
1
vote
3
answers
3k
views
How to get Transaction Action Etherscan
I'm trying to get Transaction Action information from Etherscan Apis by using a transaction hash without success.
Here is what I want to extract (Swap 1 Ether For 2 Yf-DAI) with the API.
I have ...
- 111
1
vote
2
answers
786
views
Extract v, r and s from signature for use with pyethereum.transaction library
Given an unsigned transaction, constructed using pythereum.transaction, and a signature, created by signing the transaction's hash with a private key, how do I extract the v, r, s values from the ...
- 579
1
vote
1
answer
160
views
The official library for work with ethereum payments
I looking for way to generate ether wallet (priv-pub pair), handle incoming transaction to that wallet and make/push to network transaction from it.
How to do that via go-ethereum or pyethereum (full ...
- 79
1
vote
1
answer
553
views
ecrecover not giving back the adress of the sender
I am trying to understand how eliptic curve work and when i try to get the sender of this transaction: https://etherscan.io/tx/0x14a298c1eea89f42285948b7d51eeac2876ca7406c9784b9b90dd3591d156d64 ( ...
- 1,114
1
vote
1
answer
245
views
Connect pyethapp to testrpc - Is there an equivalent to `geth attach` in pyethapp?
I have an instance of testrpc running:
testrpc -a 1000
when using geth, I'd do this:
geth attach rpc:http://localhost:8545
to link to it.
I have pyethapp installed and would like to do something ...
- 8,548
1
vote
1
answer
246
views
Which testnet? Which Linux client?
I have been watching Ethereum for a couple years, have had that Mist thing installed, I lost $40 in The DAO. The time has come around again for me to pay attention and I want to do a testnet.
I have ...
- 11
1
vote
1
answer
1k
views
web3.js how to perform POST requests?
After reading the documentation here and here I tried running the balance checker script from here. I've modified the path to the source files and my code looks like (I've downloaded all javascript ...
- 5,294
1
vote
1
answer
2k
views
pytest test_contracts.py error: ImportError: cannot import name state_transition
I am struggling to set up pyethereum on an old ThinkPad T500 running Ubuntu 16.04 and Python 2.7.11+, following installation instructions here and here.
When I test the installation with:
pyethereum/...
- 51
1
vote
0
answers
698
views
How to parse internal transactions in order to find the transactions values
I would like to parse the transactions with the following transaction hash:
0xcad1183ecf7f278713858d92c06f00934f79a75eb5c852352a3ac35de07e151c
More specifically, I'm interested to find out that 5 + ...
- 11
1
vote
0
answers
61
views
Creating a dapps [duplicate]
I'd like to create an ethereum based dapp and coin, looking trough the code for some popular projects I could see they mostly use python but I couldn't find any solidity code.
Is this normal? How is ...
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