如果每列的字符数不同，如何从200+列中删除列名的前x个字符

import pandas as pd

# 读取包含列名的数据文件或表格
df = pd.read_csv("data.csv")

# 遍历每一列的列名并删除前x个字符
x = 3  # 设置要删除的前x个字符数
df.columns = [col[x:] for col in df.columns]

# 保存修改后的数据文件或表格
df.to_csv("updated_data.csv", index=False)

import java.io.*;
import org.apache.poi.ss.usermodel.*;

public class RemoveColumnNames {

    public static void main(String[] args) {
        String inputFile = "data.xlsx";
        String outputFile = "updated_data.xlsx";
        int x = 3;  // 设置要删除的前x个字符数

        try (Workbook workbook = WorkbookFactory.create(new FileInputStream(inputFile))) {
            Sheet sheet = workbook.getSheetAt(0);
            Row headerRow = sheet.getRow(0);

            // 遍历每一列的列名并删除前x个字符
            for (Cell cell : headerRow) {
                String columnName = cell.getStringCellValue();
                cell.setCellValue(columnName.substring(x));
            }

            // 保存修改后的数据文件或表格
            try (OutputStream fileOut = new FileOutputStream(outputFile)) {
                workbook.write(fileOut);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}