Negate var using not

[arnomoonens]

Describe the bug
Negating a var using not v does not work.

To Reproduce
For example, creating a var in State is_false: bool = False and then using rx.cond(not State.is_false, rx.text("negated"), rx.text("not negated")). It always shows the text not negated.

Expected behavior
I expected the var to be correctly negated.

Specifics:

• Python Version: 3.11.5
• Reflex Version: 0.2.6
• OS: macOS 13.5.1 (22G90)
• Browser (Optional): Arc; version 1.6.0 (41215)

Additional context
It works using ~State.is_false but it would me more user-friendly if it works using not.

[Lendemor]

According to what @pickelo said, Python will not let us override the not so we can't do anything about that.
Quote from our Discord :

The not, and, and or operators are unfortunately not able to be overriden in Python. To use with vars, we have the equivalents which are ~, &, and |

[picklelo]

To negate the var, you can use the ~ operator:

rx.cond(~State.is_false, rx.text("negated"), rx.text("not negated"))

[masenf]

Yeah unfortunately we will have to close this, since it's not currently possible without AST manipulation, which we're not getting into at this point.

I implemented #1750 which will raise a TypeError when trying to use a Var with if, and, or or not and suggest the use of our alternative operations. That will have to be enough for now.