what sorting function is used by python sort code example

Example 1: sort in python'

arr = [1,4,2,7,5,6]
#sort in ascending order
arr = arr.sort() 

#sort in descending order
arr = arr.sort(reverse = True)

Example 2: python sort

nums = [4,8,5,2,1]
#1 sorted() (Returns sorted list)
sorted_nums = sorted(nums)
print(sorted_nums)#[1,2,4,5,8]
print(nums)#[4,8,5,2,1]

#2 .sort() (Changes original list)
nums.sort()
print(nums)#[1,2,4,5,8]