Python - 列表中的交叉模式对

给定两个列表，将它们以交叉模式对角配对 [适用于偶数和等长列表]。

Input : test_list1 = [4, 5, 6, 2], test_list2 = [9, 1, 4, 7] 
Output : [(4, 1), (5, 9), (6, 7), (2, 4)] 
Explanation : Crosslinked diagonally, 4->1, 5->9.

Input : test_list1 = [4, 5], test_list2 = [9, 1] 
Output : [(4, 1), (5, 9)] 
Explanation : Crosslinked diagonally, 4->1, 5->9. 
 

方法#1：使用循环

在这里，我们遍历列表并测试偶数或奇数索引，在偶数索引的情况下，我们与其他列表的下一个元素配对，否则与其他列表的前一个元素配对。这样就形成了交叉模式元组。

Python3

# Python3 code to demonstrate working of
# Cross Pattern Pairs in List
# Using loop
  
  
# function to generate cross pattern pairs
def crossPair(test_list1, test_list2):
  
    # lengths of both lists should be equal
    if len(test_list1) != len(test_list2):
        return -1
  
    res = []
    for idx in range(len(test_list1)):
  
        # checking for conditions
        if idx % 2 == 0:
            res.append((test_list1[idx], test_list2[idx + 1]))
        else:
            res.append((test_list1[idx], test_list2[idx - 1]))
    return res
  
  
# initializing lists
input_list1 = [4, 5, 6, 2, 8, 9]
input_list2 = [9, 1, 4, 7, 9, 2]
  
# printing original lists
print("The original list 1 is : " + str(input_list1))
print("The original list 2 is : " + str(input_list2))
  
# printing result
print("Paired List elements : ", crossPair(input_list1, input_list2))

输出：

The original list 1 is : [4, 5, 6, 2, 8, 9]
The original list 2 is : [9, 1, 4, 7, 9, 2]
Paired List elements :  [(4, 1), (5, 9), (6, 7), (2, 4), (8, 2), (9, 9)]

方法#2：使用列表理解

使用与上述方法类似的方法，不同之处在于列表理解被用作解决这个问题的单一线性替代方案。

蟒蛇3

# Python3 code to demonstrate working of
# Cross Pattern Pairs in List
# Using list comprehension
  
  
# function to generate cross pattern pairs
def crossPair(test_list1, test_list2):
  
    # lengths of both lists should be equal
    if len(test_list1) != len(test_list2):
        return -1
  
    # list comprehension used as one liner alternative
    res = [(test_list1[idx], test_list2[idx + 1]) if idx % 2 ==
           0 else (test_list1[idx], test_list2[idx - 1]) for idx in range(len(test_list1))]
    return res
  
  
# initializing lists
input_list1 = [4, 5, 6, 2, 8, 9]
input_list2 = [9, 1, 4, 7, 9, 2]
  
# printing original lists
print("The original list 1 is : " + str(input_list1))
print("The original list 2 is : " + str(input_list2))
  
# printing result
print("Paired List elements : ", crossPair(input_list1, input_list2))

输出：

The original list 1 is : [4, 5, 6, 2, 8, 9]
The original list 2 is : [9, 1, 4, 7, 9, 2]
Paired List elements :  [(4, 1), (5, 9), (6, 7), (2, 4), (8, 2), (9, 9)]