vyper | Pythonic Smart Contract Language for the EVM | Cryptocurrency library
kandi X-RAY | vyper Summary
kandi X-RAY | vyper Summary
Pythonic Smart Contract Language for the EVM
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Top functions reviewed by kandi - BETA
- Create a contract function from a functionDef node
- Get global namespace
- Return the value of a field
- Check if a node is kwargable
- Check for loops
- Return the ancestor of this node
- Returns a copy of the exception with the given annotations
- Checks if target_node is a valid iterator
- Construct a global context from a module
- Parse a Compare operator
- Look up the IR for a self - call
- Builds an IR code block
- Visit a variable declaration
- Build an IR expression
- Fetches the call return definition
- Build an IR instruction
- Create an event from an EventDef node
- Build an IR node
- Build the IR code for concatenation
- Builds an IR expression
- Safe multiplication
- Generate IR nodes for the given module
- Build IR node
- Parse an attribute
- Build IR code
- Parse command line arguments
vyper Key Features
vyper Examples and Code Snippets
Lines of Code : 128
License : No License
Copy###########################
# Gav Token Contract
TOTAL_TOKENS = 100_000_000_000
## Endows creator of contract with 1m GAV.
def setup
@balances = Mapping.of( Address => Money )
@balances[msg.sender] = TOTAL_TOKENS
end
## Send $((valueInmGAV
# Solidity-Compatible EIP20/ERC20 Token
# Implements https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
# The use of the uint256 datatype as in this token is not
# recommended, as it can pose security risks.
# This token is brownie console
>>> token = Token.deploy("Test Token", "TST", 18, 1e21, {'from': accounts[0]})
Transaction sent: 0x4a61edfaaa8ba55573603abd35403cf41291eca443c983f85de06e0b119da377
Gas price: 0.0 gwei Gas limit: 12000000
Token.constru python -m pip install --user cython
python -m pip install --user cytoolz
python -m pip install --user eth-brownie
Community Discussions
Trending Discussions on vyper
QUESTION
I'm trying to install eth-brownie using 'pipx install eth-brownie' but I get an error saying
...ANSWER
Answered 2022-Jan-02 at 09:59I used pip install eth-brownie and it worked fine, I didnt need to downgrade. Im new to this maybe I could be wrong but it worked fine with me.
QUESTION
I tried installing brownie via pipx, pip and the github repo , but each time I get this error on running brownie:
ANSWER
Answered 2021-Dec-15 at 17:30I finally managed to solve this. I figured out that the error was due to vyper, as vyper --version also gave a similar error.
So, I went to the last exception raised:
QUESTION
I am practicing the smart contract and NFT looks interested to me.
ERC721 written in Vyper
What is the mechanic of approve in it?
What is isApprovedForAll does?
IMO. I don't need to use approve method. I just use transferFrom() is enough.
Correct me if I am wrong
ANSWER
Answered 2021-Nov-17 at 23:26The approval mechanism is described in more depth in the ERC-721 standard.
What is the mechanic of approve in it?
A token owner can approve another address (an operator) to spend a specific token using the approve() function, as well as all of the owner's tokens using setApprovalForAll().
What is
isApprovedForAlldoes?
It's a getter function returning bool value whether an operator address can spend all of the owner tokens (i.e. they have been approved using the setApprovalForAll() function) - or not.
I don't need to use approve method. I just use transferFrom() is enough.
Correct if you're only spending your own tokens.
If you want another address to spend your tokens, or if you want to spend tokens belonging to another owner (possibly one of your other addresses), you'll need to use the approval mechanism.
QUESTION
My code has two navigation bars. One in vertical and other in horizontal format.
The first issue:
I set the vertical bar such that it's scroll is active by this CSS code:
...ANSWER
Answered 2021-Aug-01 at 11:29I did refactor your code, for improve it. And fixed issues you wanted to solve.
QUESTION
Here is the smart contract, written in vyper, to be tested
...ANSWER
Answered 2021-Apr-16 at 08:01You can use the overrides parameter. It's used after all contract function arguments.
In your case, the contract function has 0 arguments so the overrides is on position 1.
QUESTION
- vyper Version (output of
vyper --version): 0.2.8+commit.069936f - OS: osx
- Python Version (output of
python --version): Python 2.7.16 - Environment (output of
pip freeze):
ANSWER
Answered 2021-Mar-11 at 07:07Look at the description of range-function, there just one way to pass a variable to it:
QUESTION
I'm working on a uni project based on blockchain, and I have to audit our system, check known attacks, ect. This the the document that I check, principaly, since i start to work on smart contracts issues first : Known-attack ethereum smart contract
I have trouble understanding the example used in the "Dos With (unexpected) revert attack" part. I share the code :
...ANSWER
Answered 2021-Feb-08 at 11:40If send() target address is a smart contract it will execute the fallback function.
If the currentLeader points to a smart contract that has a fallback function that has been intentionally made to revert on failed send, the bid() won't work for any participants until currentLeader has been changed.
This is not a "DoS" attack but simply gotcha in Solidity programming.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
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See the Vyper documentation for build instructions.
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