How to pass arguments on different method from C# to python?

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C#

Python2.7

I have a C# form which has 2 buttons. The first button will generate a matrix , so i need to fill a textbox called rTb. rTb textbox will get a number which be the matrix range. If rTb is 10, so the matrix will randomly generate in range from -10 to 10.But the method is from python script.

Process p = new Process(); // create process (i.e., the python program
                p.StartInfo.FileName = "C:\\Python27\\python.exe";
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.UseShellExecute = false; // make sure we can read the output from stdout
                p.StartInfo.Arguments = "script.py " + rTb.Text; // start the python program with two parameters
                p.Start(); // start the process (the python program)
                StreamReader s = p.StandardOutput;
                String output = s.ReadToEnd();
                string[] r = output.Split(new char[] { ' ' }); // get the parameter
                string q = r[0];
                string[] words = q.Split('.');
                mTb1.Text = words[0];
                mTb2.Text = words[1];
                mTb3.Text = words[2];
                mTb4.Text = words[3];
                mTb5.Text = words[4];
                mTb6.Text = words[5];
                mTb7.Text = words[6];
                mTb8.Text = words[7];
                mTb9.Text = words[8];
                p.WaitForExit();

and the python script

import sys
from random import randrange


# check the get_determinant if 1 or -1
def get_determinant(key):  
    result = (key[0] * ((key[4] * key[8]) - (key[5] * key[7]))) - \
        (key[1] * ((key[3] * key[8]) - (key[5] * key[6]))) + \
        (key[2] * ((key[3] * key[7]) - (key[4] * key[6])))
    return result


# generate random matrix with key range and get_determinant must either 1 or -1 
# for singularity
key_range = int(sys.argv[1])
a = 0
while a == 0:
    key_matrix = []
    for i in range (9): key_matrix.append(randrange(-key_range,key_range))
    if get_determinant(key_matrix) == 1 or get_determinant(key_matrix) == -1: break   
m = ''
for i in key_matrix:
    m = m + str(i) + '.'
print m + str(get_determinant(key_matrix))

No problem with the output in the C# form.
The problem is when i do it with different button, called it RSA button, it'll randomly generate p, q, e, and set it to each textbox. But i need to fill the digitTb for p, q key length. Says it 2, so the p, q digit will get ex: 12,43,23 all in 2 digits. but when i pass the argument

Process p = new Process(); // create process (i.e., the python program
                p.StartInfo.FileName = "C:\\Python27\\python.exe";
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.UseShellExecute = false; // make sure we can read the output from stdout
                p.StartInfo.Arguments = "script2.py" + digitTb.text;// start the python program with two parameters
                p.Start(); // start the process (the python program)
                StreamReader s = p.StandardOutput;
                String output = s.ReadToEnd();
                string[] r = output.Split(new char[] { ' ' }); // get the parameter
                string q = r[0];
                string[] words = q.Split('.');
                pTb.Text = words[0];
                qTb.Text = words[1];
                eTb.Text = words[2];
                p.WaitForExit();

and the python script2

import sys
from random import randrange
from fractions import gcd

# lehmann primality check method
def lehmann(p):
    a = randrange(1, p)
    res = (a ** ((p - 1)/2)) % p
    if res == 1 or res == p - 1: return True
    else: return False

# check a random number p givren on parameter with lehmann
# will return p as prime and none if p is composite
def check_prime(p):  
    error = []    
    for i in range(10):
        if lehmann(p) == False: 
            error.append(0) 
            pass
        else: error.append(1)
    i = 0
    for e in error:
        i += 1
        if e != 1: break
        if i == len(error): return p

a = 10**str(sys.argv[1])
# generate 2 prime number for unique p, q	

prime = []

while len(prime) != 2:
    result = check_prime(randrange(50,a))
    if result != None: prime.append(result)
    
# RSA Scheme	
p = prime[0]
q = prime[1]
n = p * q
totient = ( p - 1 ) * ( q - 1 )

# choose e
e = []
for i in range( 2, n ): 
    if gcd ( i, totient ) == 1: e.append( i )
e = e[0]   
m = ''
for i in prime:
    m = m + str(i) + '.'
print m + str(e)

the error says "Index was outside the bounds of the array". i think the argument cant pass to python script. i will appreciate if anyone help.