如何连接每个组的特定列的所有字符串

import pandas as pd

# 创建一个数据框
data = {'A': ['hello', 'world', 'python'],
        'B': ['programming', 'language', 'is']}
df = pd.DataFrame(data)

# 连接特定列的所有字符串
result = df['A'].str.cat(df['B'], sep=' ')
print(result)

const data = [
  { A: 'hello', B: 'programming' },
  { A: 'world', B: 'language' },
  { A: 'python', B: 'is' }
];

const result = data.map(item => item.A + ' ' + item.B);
console.log(result);

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

public class Main {
    public static void main(String[] args) {
        List<String[]> data = new ArrayList<>();
        data.add(new String[]{"hello", "programming"});
        data.add(new String[]{"world", "language"});
        data.add(new String[]{"python", "is"});

        List<String> result = new ArrayList<>();
        for (String[] row : data) {
            result.add(row[0] + " " + row[1]);
        }
        System.out.println(result);
    }
}

using System;
using System.Collections.Generic;

class MainClass {
    public static void Main (string[] args) {
        List<string[]> data = new List<string[]> {
            new string[]{"hello", "programming"},
            new string[]{"world", "language"},
            new string[]{"python", "is"}
        };

        List<string> result = new List<string>();
        foreach (string[] row in data) {
            result.Add(row[0] + " " + row[1]);
        }
        Console.WriteLine(string.Join(", ", result));
    }
}