Unable to pass parameters to pythonscript from ant build.xml file. How can i pass the value?

I am trying to run a python program from my ant build.xml file when running the build.xml file i am unable to pass arguments to python script

Python program to check factorial of a given number:

fact.py

#!/usr/bin/python

def factorial(num):
    if num == 1:
        return num
    else:
        return num * factorial(num - 1)

 num = int(input('Enter a Number: '))
 if num < 0:
     print 'Factorial cannot be found for negative numbers'
 elif num == 0:
     print 'Factorial of 0 is 1'
 else:
     print ('Factorial of', num, 'is: ', factorial(num))

The build.xml file looks like as below:

<project name="ant_test" default="python" basedir=".">
<target name="python" >
        
        <exec dir="D:\app\python" executable="D:\app\python\python.exe" failonerror="true">
            <arg line="D:\app\ant-workout\fact.py/>
        </exec>
</target>

when running the build.xml file it runs the fact.py python program and it was expecting a user input to check the factorial of a given number .

How can i pass the number to the python program from ant build.xml file

Thanks in Advance!!!!!