Vyper Cheatsheet

Types

Integer

Unsigned : uint256

Signed : int128

Operators

• Comparison: <, >, <=, >=, ==, !=
• Arithmetic: +, -, unary -, *, /, **, %, min(), max()
• Bitwise: bitwise_and(), bitwise_not(), bitwise_or(), bitwise_xor(), shift()

In shift(a, _shift) _shift must be of the type int128, where positive _shift means a left shift and negative _shift means a right shift.

Decimels

decimal: Holds a decimal fixed point value.

Operators

• Comparison: <, >, <=, >=, ==, !=
• Arithmetic: +, -, unary -, *, /, **, %

Address

address: Holds an Ethereum address (20 byte value).

Members

• balance: Get balance of the address in wei_value.
• codesize: Get code stored at this address. Returns int128.

Time

timestamp: Holds the time

timedelta: Time difference

Two timedelta or a timedelta and a timestamp can be added together . It is not possible to add two timestamp values.

wei_value

wei_value: Holds amount of Ether in its smallest denomination.

Boolean

bool: true or false

Operators: not, and, or, ==, !=

Structs

User defined data type.

<struct_name>: {
    <value>: <data_type>,
    <value>: <data_type>,
    ...
}

Mappings

Mappings are similar to hash tables.

<mapping_name>: <value_type>[<key_type>]

Functions

Structure

def <function_name>(<param_name>: <param_type>, ...) -> <return_type>:
    <definition>
    ...

Constructor

Function which is called during contract creation

def __init__(_a: address, _b: bool):
  self.a = _a;
  self.b = _b