Объясните пожалуйста, как вытащить из списка самое большое и самое маленькое число

def maxMin(iterable):
    max_ = None
    min_ = None
    for x in iterable:
        if max_ is None or x > max_:
            max_ = x
        if min_ is None or x < min_:
            min_ = x
    return max_, min_

from itertools import tee
 
 
def maxMin(iterable):
    it1, it2 = tee(iterable)
    return max(it1), min(it2)

import random
n = int(input())
mlist = list(random.randint(1, 10) for i in range(n))
print(mlist)
print(max(mlist))
print(min(mlist))

import random
n = 25
mlist = [random.randint(-19, 10) for i in range(n)]
print(mlist)
m = mlist[0]
mn = mlist[0]
for i in mlist:
    if i > m:
        m = i
    if i < mn:
        mn = i
print(m)
print(mn)

def maxMin(iterable):
    max_ = next(iterable)
    min_ = max_
    for x in iterable:
        if x > max_:
            max_ = x
        if x < min_:
            min_ = x
    return max_, min_

import heapq
import random
 
 
def max_min(args: list) -> tuple[int, int]:
    return *heapq.nlargest(1, args), *heapq.nsmallest(1, args)
 
 
print(arr := [random.randint(-19, 10) for i in range(10)])
print(max_min(arr))