Description of the location of integer object storage in Python

In Python Integer Objects are stored in different locations. Some are pre-allocated memory and are always stored in memory, while others are in use. When opening up space.

The reason for saying this, you can look at the following code:

a = 5
b = 5
a is b # True
a = 500
b = 500
a is b # False

It can be seen from the above code that the integer type 5 is has always existed, but the integer type 500 has not always existed.

So which integersare pre-allocated memory addresses?

a, b, c = 0, 0, 0
i = 0
while a is b:
    i += 1
    a, b = int(str(i)), int(str(i))
else:
    print(i) # 打印 257

As we know from the above, non-negative integers less than or equal to 256 (2**8) are always stored (that is to say, their memory addresses are allocated in advance and do not need to be allocated later)

a = -1
b = -1
a is b # False

And negative numbers will not be pre-allocated.

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