Questions tagged [vyper]
The Python-like smart contract programming language
0
votes
1answer
19 views
Can't import a contract interface in vyper
I need to import a contract interface using the JSON ABI but I get syntax error when trying to import the interface.
I have created the JSON file in remix and named it IERC1620.json then I am trying ...
1
vote
1answer
32 views
How to declare a storage variable in vyper?
I am trying to convert my solidity code into vyper but I can't find a way to declare a storage variable.
My solidity function was this:
struct Account {
uint256 balance; // Account's balance
uint256 ...
0
votes
1answer
27 views
Cannot use external contract addresses as function arguments in Vyper contract interface
I'm trying to compile the Uniswap Exchange contract using the latest vyper compiler.
I first updated the ERC20 references to the new token: ERC20 definition and set up an import from vyper.interfaces ...
0
votes
0answers
21 views
Cannot use abigen to make vyper bindings
using the command
abigen --vy=uniswap_exchange.vy --pkg=uniswap --out=UniswapExchange.go
results in the error: flag provided but not defined: -vy
support for the vyper compiler was just added a ...
2
votes
1answer
155 views
Solidity Vs Vyper
What is the key differences between Solidity and Vyper?
In present and future which one can more acceptable for making smart contracts and why?
1
vote
1answer
69 views
Uint256 division in vyper (and solidity)
Floating point division is not supported in solidity as mentioned here: How can I perform float type division in solidity?
I want to divide two uint256 numbers and save them as a decimal, retaining ...
0
votes
2answers
89 views
Vyper and ethereum: how do I read a public constant function on another contract?
I'd like to call a constant function on one contract (X) from another contract (Y). I have the ABI and address for X. X and Y are both on Ropsten. I can interact with X fine using, for example, MEW.
...
2
votes
0answers
37 views
query about function call in ethereum vyper [closed]
How the function will be called in vyper while compiling?, how the variables will be declared and how the data will be mapped to that variables?
0
votes
1answer
103 views
Vyper: Truffle test read mapping value inside struct
I have the following struct inside my vyper file:
races: public({
start: timestamp,
end: timestamp,
racersBetHash: bytes32[address],
racersBetAmount: wei_value[address]
}[int128])
Then I ...
1
vote
0answers
25 views
Vyper OPCODES gas estimate at compile time
I am trying to dissect Vyper at lower levels to understand how the gas estimates are generated. I tried following the yellow paper and I searched every single line of the compiler but I can't get it ...
1
vote
0answers
142 views
What are the downsides of using vyper and truffle together
Recently I read an article Vyper+Truffle and wanted to build a token deployer using vyper contracts.
I was wondering if anyone knew the current downsides of using Vyper and truffle together?
Is it ...
3
votes
1answer
94 views
When is Vyper going to be production ready?
At a high level, Vyper seems like a much more adoptable language compared to Solidity. Everywhere I look, Vyper is still considered to be "experimental".
Any idea of when it will be production ready? ...
1
vote
0answers
100 views
Anyway to tell what Vyper can and cannot accomplish compared to Solidity?
After studying both Solidity and Vyper, I really like Vyper's strong security and simplicity. However one thing got me somehow worried, is that unlike Solidity, Vyper is not a Turing Complete language....
1
vote
1answer
155 views
Vyper and strings
How can I manipulate strings in Vyper?
In solidity I could use Nick Johnson's string library. He's using assembly to do that. But that's not possible with Vyper as far as I know.
0
votes
1answer
268 views
How to resolve Vyper installation error: fatal error: leveldb/db.h
Created a virtualenv with python3.6 and performed the following steps
git clone https://github.com/ethereum/vyper.git
cd vyper
make
I see following error(s):
Downloading https://files.pythonhosted....
0
votes
1answer
75 views
How to fix an error with Vyper: invalid syntax (, line 168)
I'm trying to figure out why the following line is giving the error at https://vyper.online/: invalid syntax (, line 168).
Line 168 is self.collator_pool.empty_slots_stack_top] = index).
@internal
...
1
vote
1answer
108 views
How to launch test with Viper?
I would like to switch the smart contract compiler from Solidity to Viper. I'm following the Viper support page found in Populus documentation.
This is what I get at the final step:
Mac:tutorial ...
9
votes
2answers
7k views
Solidity vs Viper? [closed]
I am new to smart contract development and I really want to understand how it all works, and start programming smart contracts.
I don't care for JavaScript syntax, but I love Python. I know Serpent ...
2
votes
1answer
475 views
How to call the functions of Ethereum Smart Contract from Android/iOS application?
I've been learning solidity & viper for some time now but i am wondering if it's possible to call the functions/methods of a smart contract (already deployed on Ethereum Network) from an Android/...
5
votes
2answers
8k views
Are there any implementations of smart contracts in Python?
I want to implement some smart contracts and I am strongest in python.
7
votes
1answer
502 views
How to install and test Viper programming language?
Viper is a new functional, strongly typed, bounds/overflow-checking, fixed-point-decimal python syntax-based HLL. The repository does not inlcude any documentation yet.
I built and installed ...
