Найдите в списке два ближайших друг к другу числа

def minimum_absolute_difference(integers_list):
    sorted_list = sorted(integers_list)
    min_absolute_difference = float("inf")
    min_pairs_list = []
 
    for index in range(0, len(sorted_list)-1):
        small_num = sorted_list[index]
        large_num = sorted_list[index+1]
        abs_diff = abs(large_num - small_num)
        if abs_diff == min_absolute_difference:
            min_pairs_list.append([small_num, large_num])
        elif abs_diff < min_absolute_difference:
            min_absolute_difference = abs_diff
            if len(min_pairs_list) == 0:
                min_pairs_list.append([small_num, large_num])
            else:
                # creates new min_pairs_list with pair items
                min_pairs_list = [[small_num, large_num]]
        else:
            # absolute min difference of pairs is larger than min_absolute_difference
            pass
 
    return min_pairs_list
 
num = [9, 4, 1, 6]
print(minimum_absolute_difference(num))

from itertools import pairwise
 
a = [9, 4, 1, 6]
print(*min(pairwise(sorted(a)), key=lambda x: x[1] - x[0]))

num = [9, 4, 1, 6]
num.sort(reverse = True)
y = num[0]
result = []
 
for x in range(len(num)-1):
    diff = num[x]-num[x+1]
    
    if y == diff not in result:
            result.append([num[x+1],num[x]])
            
    if  diff < y:
        y = diff
        result = [[num[x+1],num[x]]]    
print(result)

num = [9, 4, 1, 6, 25, 27, 31, 33]
num.sort(reverse=True)
y = num[0]
result = []
for x in range(len(num) - 1):
    diff = num[x] - num[x + 1]
    if y == diff not in result:
        result.append([num[x + 1], num[x]])
    if diff < y:
        y = diff
        result = [[num[x + 1], num[x]]]
print(result)