# based on https://stackoverflow.com/a/39381428
# Parses and executes a block of Python code, and returns the eval result of the last statement
import ast
def exec_then_eval(code, _globals, _locals):
    block = ast.parse(code, mode='exec')
    # assumes last node is an expression
    last = ast.Expression(block.body.pop().value)
    exec(compile(block, '<string>', mode='exec'), _globals, _locals)
    return eval(compile(last, '<string>', mode='eval'), _globals, _locals)