Example from README do not work for prg.evaluate function

[msergg]

Example from README do not work for prg.evaluate function

import celpy
from celpy import CELEvalError

env = celpy.Environment()

# Press the green button in the gutter to run the script.
if __name__ == '__main__':
    all_positive = "data.all(x, x>0)"
    breaks = {'data': [1, 2, 3] }

    ast = env.compile(all_positive)
    prgm = env.program(ast)

    prgm.evaluate(breaks)

   .venv/lib/python3.13/site-packages/celpy/evaluation.py", line 1461, in relation
    }[left_op.data]
      ^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'data'

python -V
Python 3.13.0

[msergg]

Solution is to use python 3.12 o lower