如何在Python的列表项中插入字符串

问题描述

我有清单：

['Happy Family','2122540624','213 E Broadway # A,New York,NY 10002,United States']

我想在第一项中添加一个'，'，

 ['Happy Family,',United States']

任何朋友都知道该怎么做？

解决方法

import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        List<String> firstList = new ArrayList<String>(Arrays.asList("Cake","pizza","pasta","Chocolate"));
        List<String> secondList = new ArrayList<String>(Arrays.asList("Chocolate","fruits","pancake","Cake"));

        // Add firstList and secondList to a Set to get the list of unique elements
        Set<String> thirdList = new LinkedHashSet<>();
        thirdList.addAll(firstList);
        thirdList.addAll(secondList);

        // Create fourthList and fifthList out of thirdList
        List<String> fourthList = new ArrayList<>(thirdList);
        List<String> fifthList = new ArrayList<>(thirdList);

        // Remove all elements of firstList from fourthList
        fourthList.removeAll(firstList);

        // Remove all elements of secondList from fifthList
        fifthList.removeAll(secondList);

        // Create a new list by joining fourthList and fifthList
        List<String> sixthList = new ArrayList<>();
        sixthList.addAll(fifthList);
        sixthList.addAll(fourthList);

        System.out.println("Elements not common in both the lists: " + sixthList);
    }
}

结果：

Elements not common in both the lists: [pizza,pasta,fruits,pancake]

您可以尝试

,

您只需要按索引获取项目并添加一个逗号，如下所示：

a = ['Happy Family','2122540624','213 E Broadway # A,New York,NY 10002,United States']
a[0] = f'{a[0]},' # f-string above python 3.6 otherwise a[0] = a[0] + ','
print(a) # Outputs ['Happy Family,',United States']