python 声明一个空的list python创建一个空列表,命名为name,1、创建一个空列表,命名为names,往里面添加Lihua、Rain、Jack、Xiuxiu、Peiqi和Black元素。#!-*-coding:utf-8-*-names=["Lihua","Rain","Jack","Xiuxiu","Peiqi","Black"]2、往(1)中的names列表里Black前面插
# IndexError: list assignment index out of range 添加元素 append方法 可以通过append方法在列表的末尾添加元素: names = ["Tom", "Jack", "Black"] print(names) # ['Tom', 'Jack', 'Black'] names.append("Jimmy") print(names) # ['Tom', 'Jack', 'Black', 'Jimmy'] insert方法 可以使用in...
dir([object]): Without arguments, return the list of names in the current local scope (similar tolocals().keys()). With an argument, attempt to return a list of valid attributes for that object. 不带参数时,返回当前范围内的变量、方法和定义的类型列表;带参数时,返回参数的属性、方法列表。如...
1names = ['Vison','Tenglan','Eric'] 通过下标访问列表中的元素,下标从0开始计数,下标取负数可以从列表结尾访问元素。 1#!/user/bin/env ptyhon2#-*- coding:utf-8 -*-3#Author: VisonWong45names = ['Vison','Tenglan','Eric']67print('Name1:',names[0])8print('Name3:',names[2])9print...
names.sort(key=lambda e: e.split()[-1]) for name in names: print(name) We have a list of names. Each name consists of a first name and last name. In addition, there are several users with the same last name. In such a case, we want them to be sorted by their first names....
不使用带有for循环的range(len(someList))技术来获取列表中条目的整数索引,而是调用enumerate()函数。在循环的每一次迭代中,enumerate()将返回两个值:列表中项的索引和列表中的项本身。例如,该代码相当于第 84 页的中的“使用带列表的循环”中的代码: >>> supplies = ['pens', 'staplers', 'flamethrowers',...
列表(List)是Python中非常重要的内置数据类型。列表由一系列元素组成,所有的元组被包含在一对方括号中。列表被创建将后,可以执行添加、删除、修改操作。 列表中可包含任意的Python数据信息,如字符串、数字、列表、元组等。 1.1 列表介绍 列表是有序集合,没有固定大小,能够保存任意数量任意类型的 Python 对象,语法为...
# 创建一个国家列表 countries = ['Japan', 'Germany', 'Norway', 'France', 'Italy', 'Spain'] # 打印原始列表 print("Original list of countries:", countries) # append() - 列表末尾添加一个新的元素 countries.append('Australia') print("List after append:", countries) # insert() - 在指定...
from sqlalchemy.exc import NoSuchTableError, NoSuchColumnError, SAWarning, SADeprecationWarning, SAWarning, InvalidRequestError, ColumnError, CircularDependencyError, TableExprListOfNamesError, MultipleResultsFoundError, NoResultFound, NoSuchTableError as STError, NoSuchColumnError as SCError, ORMCompile...
Create a Python List We create a list by placing elements inside square brackets [], separated by commas. For example, # a list of three elements ages = [19, 26, 29] print(ages) Run Code Output [19, 26, 29] Here, the ages list has three items. List Items of Different Types ...