Python – 有序元组提取

给定一个元组列表，获取所有按升序排序的元组。

Input : test_list = [(5, 4, 6, 2, 4), (3, 4, 6), (2, 5, 6), (9, 1)]
Output : [(3, 4, 6), (2, 5, 6)]
Explanation : Sorted tuples are extracted.

Input : test_list = [(5, 4, 6, 2, 4), (3, 4, 1), (2, 5, 4), (9, 1)]
Output : []
Explanation : No Sorted tuples.

方法 #1：使用列表理解 + sorted()

在此，我们检查元组是否使用 sorted() 进行排序，并且列表推导用于迭代每个元组。

Python3

# Python3 code to demonstrate working of 
# Ordered tuples extraction
# Using list comprehension + sorted()
  
# initializing list
test_list = [(5, 4, 6, 2, 4), (3, 4, 6), (9, 10, 34), (2, 5, 6), (9, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# sorted() used to order, comparison operator to test 
res = [sub for sub in test_list if tuple(sorted(sub)) == sub]
  
# printing result 
print("Ordered Tuples : " + str(res))

输出

The original list is : [(5, 4, 6, 2, 4), (3, 4, 6), (9, 10, 34), (2, 5, 6), (9, 1)]
Ordered Tuples : [(3, 4, 6), (9, 10, 34), (2, 5, 6)]

方法 #2：使用 filter() + lambda + sorted()

在这种情况下，过滤任务是使用 filter() 完成的，sorted() 馈送到 lambda 进行比较以获得所需的结果。

Python3

# Python3 code to demonstrate working of 
# Ordered tuples extraction
# Using filter() + lambda + sorted()
  
# initializing list
test_list = [(5, 4, 6, 2, 4), (3, 4, 6), (9, 10, 34), (2, 5, 6), (9, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# sorted() used to order, comparison operator to test 
res = list(filter(lambda sub: tuple(sorted(sub)) == sub, test_list))
  
# printing result 
print("Ordered Tuples : " + str(res))

输出

The original list is : [(5, 4, 6, 2, 4), (3, 4, 6), (9, 10, 34), (2, 5, 6), (9, 1)]
Ordered Tuples : [(3, 4, 6), (9, 10, 34), (2, 5, 6)]