Python - 测试列表是否为回文

给定一个列表，检查它是否是回文。

Input : test_list = [4, 5, 4] 
Output : True 
Explanation : List is same from front and rear.

Input : test_list = [4, 5, 5] 
Output : True 
Explanation : List is not same from front and rear. 

方法#1：使用列表切片

在此，我们首先提取并反转列表的第二半，然后比较是否相等，如果发现相等，则我们得出其回文。

Python3

# Python3 code to demonstrate working of 
# Test if list is Palindrome
# Using list slicing
  
# initializing list
test_list = [1, 4, 5, 4, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Reversing the list
reverse = test_list[::-1]
  
# checking if palindrome
res = test_list == reverse
  
# printing result 
print("Is list Palindrome : " + str(res))

输出

The original list is : [1, 4, 5, 4, 1]
Is list Palindrome : True

方法#2：使用reversed()

在这种情况下，我们简单地反转列表并检查原始列表和反转列表是否相似。

蟒蛇3

# Python3 code to demonstrate working of 
# Test if list is Palindrome
# Using reversed()
  
# initializing list
test_list = [1, 4, 5, 4, 1]
  
# printing original list
print("The original list is : " + str(test_list))
  
# reversing list
rev_list = list(reversed(test_list))
  
# checking for Palindrome
res = rev_list == test_list
  
# printing result 
print("Is list Palindrome : " + str(res))

输出

The original list is : [1, 4, 5, 4, 1]
Is list Palindrome : True