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#!/usr/bin/env python
# Challenge 003
#
# Challenge #2
# Create a script that generates Pascal Triangle. Accept number of rows from
# the command line. The Pascal Triangle should have at least 3 rows. For more
# information about Pascal Triangle, check this wikipedia page.
import sys
def draw_pascal(rows):
data = [1]
for row in range(1,rows+1):
# print current row
print(" "*(rows-row) + " ".join([str(x) for x in data]))
# compute next row
nxt = [1]
for col in range(0, len(data)-1):
nxt.append(data[col] + data[col+1])
nxt.append(1)
data = nxt
# main
draw_pascal(int(sys.argv[1]))
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