Constructor takes byte32 value. How send32 value, using web3.py or only python?
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2 Answers
In web3.py v4+, you can send either a hex string, or native Python bytes, like:
contract.constructor('0xf005ba11').transact()
contract.constructor(b'\xf0\x05\xba\x11').transact()
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1It doesn't work because I get "Could not identify the intended function with name"– 0x3bfcJun 11, 2018 at 10:24
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@aabdulwahed I'm guessing that you're using
ConciseContract. Try it again withoutConciseContract. If that doesn't solve your problem, please start a new question.– carverJun 12, 2018 at 22:12
How to convert/encode string to bytes32 in Python for Solidity bytes32 arguments via web3.py
zBytes = "YAY!! Less than 32"
#zBytes = "YAY!! We Are Going To Make Ethereum & Python Great! Go Crypto and Blockchain and DAG, etc...!!!"
len1 = len(zBytes)
if len1 > 32:
print('input string length: '+ str(len1)+ ' is too long')
zBytes32 = zBytes[:32]
else:
print('input string length: '+ str(len1)+ ' is too short')
print('More characters needed: '+ str(32-len1))
zBytes32 = zBytes.ljust(32, '0')
print('zBytes32 = '+ str(zBytes32)+ ' and its length: '+ str(len(zBytes32)))
xBytes32 = bytes(zBytes32, 'utf-8')
print('xBytes32 = '+ str(xBytes32))
contractInstance.functions.yourFunctionName(xBytes32).buildTransaction()
