Error with Pyethereum abi_contract() importing Serpent: "Not a function or opcode: def"

godelzilla

I'm trying to run some very basic code with pyethereum (see below). However, I keep getting this error when trying to import the serpent code with abi_contract: "Exception: Error (file "main", line 2, char 14): Not a function or opcode: def". I'm trying to define a function with "def" so I don't understand this error. I get the same error whether I save the code inline or in a file.

Any help would be greatly appreciated!

# Import tester and utils. Initiate block.
import serpent
import ethereum.tester as t
import ethereum.utils as u
s = t.state()

# Setup test keys and addresses.
key1 = u.sha3("this is an insecure passphrase")
addr1 = u.privtoaddr(key1)

# Write contract and commit to blockchain.
serpent_code='''
def multiply(a):
	return(a*2)
'''

#serpent_code = open('multiply.se').read()

c = s.abi_contract(serpent_code, sender=key1)

o = c.multiply(5)
print(str(o))

BlackShift

I've encountered the same problem yesterday. The root cause was unclear, but the error occurred when using serpent 1.6.7 as compiled from the master branch on the git repository. The problem disappeared after switching to 2.0.2 from either the develop branch or by pip installing serpent.

astronaut

Use the develop branch of serpent.

git checkout develop
make
make install