How to use pandas to read the files from argparse?

I am using argparse library to read the file to perform the comparison between two excel files. This is my code:

import pandas as pd
import numpy as np
import argparse

if __name__ == "__main__":

    parser = argparse.ArgumentParser()
    parser.add_argument('-FILE_1', '--file_1', type=str, required=True, action='append')
    parser.add_argument('-FILE_2', '--file_2', type=str, required=True, action='append')
    args = parser.parse_args()

def comparison():
    df1=pd.read_excel(args.file_1)
    df2=pd.read_excel(args.file_2)

    comparison_values = df1.values == df2.values
    rows,cols=np.where(comparison_values==False)

    for item in zip(rows,cols):
        df1.iloc[item[0], item[1]] = '{} --> {}'.format(df1.iloc[item[0], item[1]],df2.iloc[item[0], item[1]])

    df1.to_excel('./Excel_diff.xlsx', 'Sheet2', index=False,header=True)

comparison()

When I input the command into the terminal,

PS C:\Users\Documents\Excel Comparison Proj> python .\excel_comparison.py -FILE_1 "Testing.xlsx" -FILE_2 "Testing - Copy.xlsx"

There is an error:

    Traceback (most recent call last):
"C:\Users\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\xlrd\__init__.py", line 1187
        print "EXTERNSHEET(b7-):"
        ^^^^^^^^^^^^^^^^^^^^^^^^^
    SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?

Any suggestion to fix the issue so that the python can read the file from args.file_1 and args.file_2?