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Lesson 3:
Constants
Introduction to Vyper constants
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Constants
Constants are variables that is only defined at a global level. Use the keyword constant to define a constant variable.
# pragma version 0.4.0
SUPPLY_AMOUNT: constant(uint256) = 21000000
BYTES_VALUE: constant(bytes32) = 0xabcd1123f8ae9a65dcc16f95643f2030aa505c6b465c8206e26ae84b525cdacb
STRING_VALUE: constant(String[13]) = "Hello, world!"
@external
def retrieveConstants() -> (uint256, bytes32, String[13]):
return (SUPPLY_AMOUNT, BYTES_VALUE, STRING_VALUE)Vyper Differentiators
- Requires explicit specification of String length.
String length in return function must be equal to more than the constant length.