How do I make an empty bytes32 variable in vyper?

def return_empty() -> (bytes32):
    return ("")

2 Answers 2


Vyper does not have a concept of None; instead every type has a default value. For the bytes32 type that is 0x0000000000000000000000000000000000000000000000000000000000000000.

You can generate this initial value using empty(), e.g.

empty_bytes32_var: bytes32 = empty(bytes32)

ref: https://vyper.readthedocs.io/en/stable/types.html#initial-values


You can use the initial value of a bytes32, which is just EMPTY_BYTES32

def return_empty() -> (bytes32):
    return (EMPTY_BYTES32)
  • 1
    UserWarning: EMPTY_BYTES32 is deprecated. Please use empty(bytes32) instead.
    – gosuto
    Commented Dec 2, 2022 at 18:21

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