Python中的 sys.maxsize()

sys模块的maxsize属性获取数据类型为Py_ssize_t的变量的最大值 可以存储。 Python平台的指针决定了Python中列表和字符串的最大大小。 maxsize 返回的大小值取决于平台架构：

• 32 位：值将是 2^31 – 1，即2147483647
• 64 位：该值将是 2^63 – 1，即9223372036854775807

sys.maxsize

Syntax: sys.maxsize

Returns: maximum value of Py_ssize_t depending upon the architecture

示例 1：让我们在 64 位系统上获取最大的 Py_ssize_t 值。

Python3

# importing the module
import sys
       
# fetching the maximum value
max_val = sys.maxsize
print(max_val)

输出：

9223372036854775807

示例 2：创建具有最大大小的列表。

蟒蛇3

# importing the module
import sys
       
# fetching the maximum value
max_val = sys.maxsize
 
# creating list with max size
list = range(max_val)
 
# displaying the length of the list
print(len(list))
 
print("List successfully created")

输出

9223372036854775807
List successfully created

输出：

9223372036854775807
List successfully created

示例 3：尝试创建一个大小大于最大大小的列表。

蟒蛇3

# importing the module
import sys
       
# fetching the maximum value
max_val = sys.maxsize
 
try:
 
    # creating list with max size + 1
    list = range(max_val + 1)
 
    # displaying the length of the list
    print(len(list))
    print("List successfully created")
     
except Exception as e:
 
    # displaying the exception
    print(e)
    print("List creation unsuccessful")

输出

Python int too large to convert to C ssize_t
List creation unsuccessful

输出：

Python int too large to convert to C ssize_t
List creation unsuccessful