Home > Article > Backend Development > Description of the location of integer object storage in Python
Description of the location of integer object storage in Python
- 高洛峰Original
- 2017-03-16 17:09:161151browse
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.
The above is the detailed content of Description of the location of integer object storage in Python. For more information, please follow other related articles on the PHP Chinese website!