创建空数据框并向其中添加行

import pandas as pd

df = pd.DataFrame(columns=['列名1', '列名2', '列名3'])  # 创建空数据框

# 向数据框中添加行
df = df.append({'列名1': 值1, '列名2': 值2, '列名3': 值3}, ignore_index=True)

df <- data.frame(matrix(ncol=3, nrow=0))  # 创建空数据框

# 向数据框中添加行
df <- rbind(df, c(值1, 值2, 值3))

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;

import java.io.FileWriter;
import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        String[] header = {"列名1", "列名2", "列名3"};
        FileWriter fileWriter = new FileWriter("data.csv");
        CSVPrinter csvPrinter = new CSVPrinter(fileWriter, CSVFormat.DEFAULT.withHeader(header));

        // 向数据框中添加行
        csvPrinter.printRecord(值1, 值2, 值3);

        csvPrinter.flush();
        csvPrinter.close();
    }
}