> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Vyper ERC-20 Token

> A minimal ERC-20 token implementation in Vyper, showcasing Vyper's clean syntax and built-in overflow protection.

# Vyper ERC-20 Token

A minimal ERC-20 token implementation in Vyper, showcasing Vyper's clean syntax and built-in overflow protection.

A minimal ERC-20 token implementation in Vyper, showcasing Vyper's clean syntax and built-in overflow protection.

## Explanation

Vyper is a Python-inspired smart contract language that compiles to EVM bytecode. It intentionally lacks inheritance and has built-in overflow checks. The syntax is cleaner than Solidity but it's less feature-rich by design.

## Code

```vyper theme={null}
# @version ^0.3.10

name: public(String[32])
symbol: public(String[32])
decimals: public(uint8)
totalSupply: public(uint256)
balanceOf: public(HashMap[address, uint256])
allowance: public(HashMap[address, HashMap[address, uint256]])

@external
def __init__(_name: String[32], _symbol: String[32], _decimals: uint8, _supply: uint256):
    self.name = _name
    self.symbol = _symbol
    self.decimals = _decimals
    self.totalSupply = _supply
    self.balanceOf[msg.sender] = _supply

@external
def transfer(_to: address, _amount: uint256) -> bool:
    assert _to != empty(address)
    self.balanceOf[msg.sender] -= _amount
    self.balanceOf[_to] += _amount
    return True

@external
def approve(_spender: address, _amount: uint256) -> bool:
    self.allowance[msg.sender][_spender] = _amount
    return True
```

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**Canonical knowledge ID:** `code-example:vyper-erc-20-token`