Optimization mechanism in python (both 2.7 and 3.5):
Numbers between -5~257, if you use the first assignment method, then they still belong to the same memory.
But the test code I wrote on my local machine is as follows:

Result

#This is inconsistent with the above.

Then I tested it on the compiler on the Python official website and it was correct

I would like to ask what is the cause of this. . .