Understanding the location of an integer object store in Python

The Python integer object is stored in a different location, some of it is pre-allocated memory, it has been stored in memory, and others, when used to open up space.

To say the reason for this sentence, you can look at the following code:

A = 5b = 5a is b # Truea = 500b = 500a is B # False

As the above code shows, the integer 5 is always there, and the integer 500 is not always there.

So what integers are pre-allocated memory addresses?

A, b, c = 0, 0, 0i = 0while A is b:    i + = 1    A, b = Int (str (i)), int (str (i)) Else: print    (i) # printing 257

As is known, non-negative integers less than or equal to 256 (2**8) are stored all the time (i.e. their memory addresses are pre-opened and do not need to be redistributed later)

A = -1B = -1a is B # False

and negative numbers are not pre-opened.

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