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Types · easy

3. Value types

bool, int128/uint256, address, bytes32, decimal and their ranges.

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Vyper's core value types are `bool`, signed and unsigned integers (`int128`, `int256`, `uint8`...`uint256`), `address`, `bytes32`, and the fixed-point `decimal` type. There is no implicit widening between integer sizes — every conversion must go through `convert()`.

`decimal` gives you a fixed-point number with 10 digits after the point, useful for ratios without floating-point error, but it is not a substitute for careful unit handling.

is_active: public(bool)
supply: public(uint256)
rate: public(decimal)
admin: public(address)
root: public(bytes32)

Every arithmetic operation on integers reverts on overflow or underflow automatically — you never need a SafeMath-style library in Vyper.

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Check your understanding

  1. 1. What happens on integer overflow in Vyper?

  2. 2. How do you convert between integer types in Vyper?

  3. 3. What is `decimal` used for?

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