下面是一个使用mermaid语法表示的序列图,展示了去除None值的过程: List DataPython ScriptList DataPython Scriptloop[through list]创建包含None值的列表检查是否存在None值返回True调用remove方法去除None值输出去除None值后的列表 通过上面的序列图,我们可以清晰地看到去除None值的
Another approach to removing empty strings from a list is using the filter() function. Here’s an example:# Remove empty strings using the filter() function my_list = list(filter(None, my_list)) # Print the updated list print(my_list) # ['apple', 'banana', 'cherry', 'date']...
结果为None是因为python执行a.remove('s')后并不返回任何值，故为None。你可以执行a.remove('s')，然后print(a),结果为['d','s','c']
next return list ## 递归的解法 class Solution: def removeNthFromEnd(self, head, n): def remove(head): if not head: return 0, head i, head.next = remove(head.next) return i+1, (head, head.next)[i+1 == n] return remove(head)[1] 时间复杂度 这个算法的时间复杂度是 O(L),...
语法:str.split(sep=None, maxsplit=-1) [n] sep —— 分隔符,默认为空格,但不能为空即(")。 maxsplit —— 最大分割参数,默认参数为-1。 [n] —— 返回列表中下标为n的元素。列表索引的用法。 示例: #默认空格分割str1 = "I love python"str1.split()['I', 'love', 'python']#取第三位...
# Definition for singly-linked list. # class ListNode(object): # def __init__(self, x): # self.val = x # self.next = None classSolution(object): defremoveNthFromEnd(self, head, n): """ :type head: ListNode :type n: int ...
Remove duplicates from a list in Python Trey Hunner 3 min. read • Python 3.9—3.13 • March 8, 2023 Share Tags Data Structures Need to de-duplicate a list of items?>>> all_colors = ["blue", "purple", "green", "red", "green", "pink", "blue"] ...
/usr/bin/python# encoding: utf-8# -*- coding: utf8 -*-importrefromcopyimportdeepcopy old_list=['# ','# conf','NAME="Ubuntu"','VERSION="14.04.3 LTS, Trusty Tahr"']new_list=deepcopy(old_list)formemberinnew_list:ifre.search('^#+.*',member)isnotNone:old_list.remove(member)...
Given1->1->2->3->3, return1->2->3. 代码: 1#Definition for singly-linked list.2#class ListNode:3#def __init__(self, x):4#self.val = x5#self.next = None67classSolution:8#@param head, a ListNode9#@return a ListNode10defdeleteDuplicates(self, head):11ifheadisNoneorhead.nextis...
/usr/bin/python# encoding:utf-8#-*-coding:utf8-*-importre from copyimportdeepcopy old_list=['# ','# conf','NAME="Ubuntu"','VERSION="14.04.3 LTS, Trusty Tahr"']new_list=deepcopy(old_list)formemberinnew_list:ifre.search('^#+.*',member)is not None:old_list.remove(member)print...