def _check_env(self, env):
        if __debug__:
            variables = self.all_vars()

            for v in variables:
                if not env in v:
                    raise Exception("Could not find variable \"%s\" in the environment." % v)
dataset/ETHPy150Open gdanezis/petlib/examples/genzkp.py/ZKProof._check_env/swapped operands of `in`