Python sys模块中maxsize()方法教程示例

sys.maxsize()

# import the sys module to use the maxsize() method
import sys
# returns the maximum size
size = sys.maxsize
print("The maximum size of a 32-bit platform is:" , size)
#输出：
The maximum size of a 32-bit platform is: 2147483647

import sys
# returns the maximum size
size = sys.maxsize
print("The maximum size of a 32-bit platform is:" , size)
#输出：
The maximum size of a 64-bit platform is: 9223372036854775807

import sys
size = sys.maxsize
# creates the max length
list = range(size)
# returns the length of a list
print("The maximum length of a list:" , len(list))
print("List is created successfully")
#输出：
# maximum size limit on a 64-bit platform
The maximum length of a list: 9223372036854775807
List is created successfully

import sys
size = sys.maxsize
# handles the exception
try:
    # creates a list with maximum size + 1
    list = range(size + 1)
    # check the maximum size
    print(len(list))
    print("List is created successfully")
# exception if the size goes beyond the maximum size
except Exception as exception:
    print("Exception caught: ", exception)
    print("List is not created due to above exception")
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#输出：
# output shows exception occurs
Exception caught:  Python int too large to convert to C ssize_t
List is not created due to above exception

import sys
li = [20, 2, 23, 88, 3, 63, 12]
# sys.maxint is not supported in python 3. We need to use python version < 3.0
min_value = sys.maxint
for i in range(0, len(li)):
    if li[i] < min_value:
        min_value = li[i]
print("Min value : " + str(min_value))
输出：
AttributeError: module 'sys' has no attribute 'maxint'

import sys
max_int = sys.maxsize
min_int = sys.maxsize - 1
long_int = sys.maxsize + 1
print("Maximum integer size is : " + str(max_int)+" , "+str(type(max_int)))
print("Maximum integer size-1 is :" + str(max_int)+" , "+str(type(min_int)))
print("Maximum integer size+1 is :" + str(max_int)+" , "+str(type(long_int)))
#输出：
Maximum integer size is : 9223372036854775807 , <class 'int'>
Maximum integer size-1 is :9223372036854775807 , <class 'int'>
Maximum integer size+1 is :9223372036854775807 , <class 'int'>

import sys
# to use the field_size_limit method
import csv
maximum_Integer = sys.maxsize
while True:
    # read the csv with huge fields
    with open('myfile.csv', newline='') as f:
    reader = csv.reader(f)
    for row in reader:
        print(row)
    # Here, we reduce the size if there is an overflow error
    try:
        csv.field_size_limit(maximum_Integer)
        break
    except OverflowError:
        maximum_Integer = int(maximum_Integer/10)