Pascal's Triangle calculated using a recursive function in Python

PascalTriangle.py

'''
Created on Feb 24, 2015
'''
import sys

# Recursive method to create the mathematical series 
def pascal(col,row):
    if(col == 0) or (col == row):
        return 1
    else:
        return pascal(col-1,row-1) + pascal(col,row-1)

# Method returns the results of n rows in the triangle
def PascalTriangle(num):
    if (num <= 0):
        print('Number must be greater than zero')
    
    for r in range(num):
        for c in range(r+1):
            sys.stdout.write(str(pascal(c,r))+' ')
        sys.stdout.write('\n')

#Test Section
PascalTriangle(10)
'''
Output:
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
1 8 28 56 70 56 28 8 1
1 9 36 84 126 126 84 36 9 1
'''
 
PascalTriangle(0) # returns 'Number must be greater than zero'