Variable scope inside and outside functions - global statement being overridden by assignation unless preceded by reference

[Roel Schroeven]

Op 6/03/2024 om 16:39 schreef Roel Schroeven via Python-list:
> Op 6/03/2024 om 13:55 schreef Jacob Kruger via Python-list:
>> If you import the contents of that file into the python interpreter, 
>> [...]
>
> What exactly to you mean by "import the contents of that file into the 
> python interpreter"? Other people have put your code in a script, 
> executed it, and saw it working as expected. I pasted in IPython, and 
> likewise saw it working as expected, and the same with IDLE. It seems 
> to me you must be doing something different from us; maybe the way you 
> execute that code might be the key to this whole confusion.
(As an aside, I made a type; "What exactly _do_ you mean" is what I 
meant to type)

If you want, you can play with the code online here:
https://tio.run/##pVPbitswEH3XVwwJITaNQ9KllATy0EKhL/2AUsqiWKNkWlkykrzZ7NJvT0e@JWT7VmPsEZozc87RqD7Ho7MPl8sUQpQ@QukUCqG9q0DJiJEqBKpqx1vDegHp@@JsHyk0UfaY0tXnIT/FQogpkKVI0lBAcJ4OZKWBJ2kaDEKo@IjPNfkz7MYGyxB9nYJsst58XBWrNb@wWm1Xq8kCJrPvxawqZgpmX7ezb5N86bE2ssQsvpDVbjewWzaxzIUwjxFD5PI/1gt4v4CHn0xKoQblHilm@VYAPwfj9kxrpLOAHjcFGX6jgrp1CqIDjxp9CnrMk/Qk9wYDaOdh7@JRtCUTMtDBgsVTp5edYbuIZZpzl/NP@dadsvzdaG1WkW2Yy@5D3mJqTzZmIzK5pTu37p3JmcOvhkUw2XB0pxsmRxlgj2h7jqh6ygcv990pOg18ZLEV5bFo0ulpoIhVaHOTP1XNvFN21rmV91W0M8adyB64hEWoUNowGHoiY8CwVg/sp8coyQ722MHTwEWRCZYy9SVGMd9KWqqbBFWcGkgh6MaWkbgOryNKlSi2igdZV8kj6RCXpUHps4FtPz/X4QwYU6F@RlNSMoESv071digk6xqtymgoJVXXMdl027DP22xyvg8cpfLt/I0KRL@RLiDwhHanPP@M3Brn@bAu2mdc6/k4B7vXMfxzs98R2L12/@tOPrb48owlz1fH575TMTbsr8sb@CfNR3kH@x9@l8tf

(sorry for the long URL; that's where tio.run puts the code)

Again it works as expected, but with or without the l_test.clear() line.

-- 
"Il semble que la perfection soit atteinte non quand il n'y a plus rien à
ajouter, mais quand il n'y a plus rien à retrancher."
"Perfectie is niet bereikt als er niets meer toe te voegen is, maar als er
niets meer weg te nemen is."
         -- Antoine de Saint-Exupéry