Python3.8 - Substitution doesn't work

[Zbigniew Jachimowicz]

Hello. Spyder 5.0.2 and Python 3.8.8 installed.

 I wrote a little program to check the mean value calculation on the go. In the course of subsequent changes to the data value, the substitution: y_true [i] - = a / 2 9  (where: "y_true" is a vector and "a" is a variable) stopped working. Simultaneously working earlier: y_true [150: 160] = a / 2 has stopped working.

Restarting Spyder and restarting the Spyder kernel did nothing.

Has anyone had a similar problem?

[yfprojects]

Hello,

what does "stopped working" mean? What is the error message?

Kind regards

yprojects