如何绘制来自多个CSV的数据，每个CSV具有不同的列号

import pandas as pd
import matplotlib.pyplot as plt

# 读取CSV文件
csv_files = ['file1.csv', 'file2.csv', 'file3.csv']
dataframes = []
for file in csv_files:
    df = pd.read_csv(file)
    dataframes.append(df)

# 处理列号不同的情况
for i, df in enumerate(dataframes):
    if 'column_name' not in df.columns:
        df.rename(columns={'old_column_name': 'column_name'}, inplace=True)

# 合并数据
merged_df = pd.concat(dataframes)

# 绘制数据
plt.plot(merged_df['column_name'], merged_df['data_column'])
plt.xlabel('X Label')
plt.ylabel('Y Label')
plt.title('Data from Multiple CSV Files')
plt.show()