用最大元素对元组进行排序的Python程序

给定一个元组列表，按元组中的最大元素对元组进行排序。

Input : test_list = [(4, 5, 5, 7), (1, 3, 7, 4), (19, 4, 5, 3), (1, 2)] 
Output : [(19, 4, 5, 3), (4, 5, 5, 7), (1, 3, 7, 4), (1, 2)] 
Explanation : 19 > 7 = 7 > 2, is order, hence reverse sorted by maximum element.

Input : test_list = [(4, 5, 5, 7), (19, 4, 5, 3), (1, 2)] 
Output : [(19, 4, 5, 3), (4, 5, 5, 7), (1, 2)] 
Explanation : 19 > 7 > 2, is order, hence reverse sorted by maximum element. 

方法 #1：使用max() + sort()

在此，我们使用 max() 执行获取元组中最大元素的任务，并使用 sort() 操作执行排序。

Python3

# Python3 code to demonstrate working of 
# Sort Tuples by Maximum element
# Using max() + sort()
  
# helper function
def get_max(sub):
    return max(sub)
  
# initializing list
test_list = [(4, 5, 5, 7), (1, 3, 7, 4), (19, 4, 5, 3), (1, 2)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# sort() is used to get sorted result
# reverse for sorting by max - first element's tuples
test_list.sort(key = get_max, reverse = True)
  
# printing result 
print("Sorted Tuples : " + str(test_list))

输出：

The original list is : [(4, 5, 5, 7), (1, 3, 7, 4), (19, 4, 5, 3), (1, 2)]
Sorted Tuples : [(19, 4, 5, 3), (4, 5, 5, 7), (1, 3, 7, 4), (1, 2)]

方法 #2：使用 sort() + lambda + reverse

在这里，我们使用类似的功能，唯一的区别是使用 lambda fnc。而不是用于获取反向排序任务的外部函数。

蟒蛇3

# Python3 code to demonstrate working of 
# Sort Tuples by Maximum element
# Using sort() + lambda + reverse
  
# initializing list
test_list = [(4, 5, 5, 7), (1, 3, 7, 4), (19, 4, 5, 3), (1, 2)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# lambda function getting maximum elements 
# reverse for sorting by max - first element's tuples
test_list.sort(key = lambda sub : max(sub), reverse = True)
  
# printing result 
print("Sorted Tuples : " + str(test_list))

输出：

The original list is : [(4, 5, 5, 7), (1, 3, 7, 4), (19, 4, 5, 3), (1, 2)]
Sorted Tuples : [(19, 4, 5, 3), (4, 5, 5, 7), (1, 3, 7, 4), (1, 2)]