.reverse()这个方法的返回值就是空 一般使用的时候直接 list.reverse()print(list)就行 该方法没有返回值，但是会对列表的元素进行反向排序。所以直接print（list）来查看反向排列的情况就好reverse原地逆反list你执行list.reverse()print(list)
与Ruby 不同,Python3 没有一个明确的 flatten 函数。但是我们可以使用 list comprehension 来平坦一个列表的列表。 li = [[1,2,3],[4,5,6]] [i for x in li for i in x] #=> [1, 2, 3, 4, 5, 6] 1. 2. 3. 生成一个2个值之间的每个整数的列表 我们可以在2个值之间创建一个范围,然...
# 输出结果:[1, 2, 5, 9, 10, 23, 43] # sort(reverse):从大到小降序排列 s = [5,9,1,2,10,23,43] s.sort(reverse=True) print(s) # 输出结果:[43, 23, 10, 9, 5, 2, 1] # reverse:倒序排列 s = [1,2,3,4,5,6,7,8,9] s.reverse() print(s) # 输出结果:[9, 8, ...
print(list(reversed([1, 2, 3]))) # 输出: [3, 2, 1] 4. 迭代与生成 range(start, stop, step):生成整数序列。 python 复制代码 print(list(range(5))) # 输出: [0, 1, 2, 3, 4] enumerate(iterable, start=0):返回索引和值的迭代器。 python 复制代码 for i, v in enumerate(["a",...
```python class ListNode: def __init__(self, val=0, next=None): self.val = val self.next = next def reverse_linked_list(head): prev = None curr = head while curr: next_node = curr.next curr.next = prev prev = curr curr = next_node return prev # 测试 node1 = ListNode(1)...
The reverse integer: 654321 RUN 2: Enter a positive value: 362435 The reverse integer: 534263 In Python,[::-1] is used to reverse list, string, etc. It is a property of slicing of the list. By using the above code, we can reverse a string that contains only digits, to practice mo...
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Program to print negative numbers in a list using loop # Python program to find negative numbers from a list# Getting list from usermyList=[]length=int(input("Enter number of elements : "))foriinrange(0,length):value=int(input())myList.append(value)# printing all negative values of th...
题库 CCF编程能力等级认证(GESP) 题目列表 执行Python代码 print(list("CCFGESP").rev...判断题 执行Python代码 print(list("CCFGESP").reverse()) 与 print(list("CCFGESP")[::-1]) ,其输出的结果相同。A. 正确 B. 错误上一题 [判断题] 执行下列Python代码,输出的结果是 ["banana", "apple", ...
#python有6个字符,它的索引从0开始,最大为5#正向数字索引one_str ="python"print(one_str[5])#结果为:n#反向数字索引print(one_str[-3])#结果为:h#切片操作,只能取到结束索引的前一位print(one_str[2:4])#结果为:th 3、字符串的切片