!= in policies is replaced with not=

[sanguinedab]

When I define a policy, the != symbol is replaced by not=

I tested it with an online editor and it was normal, but it might be because it is a nodejs version

I got an error when using it in Python code. I checked the source code and it is probably caused by here. It replaces all '!' with 'not'

`
@staticmethod
def _get_expression(expr, functions=None):
expr = expr.replace("&&", "and")
expr = expr.replace("||", "or")
expr = expr.replace("!", "not")

  return SimpleEval(expr, functions)

`

Is there any good solution? Thanks