Pascals rectangle.py

#! /usr/bin/python
# -*- coding: UTF-8 -*-
 
# Pascal´s Rectangle
 
start = int(raw_input("Starting number: "))

pascal = [[start]] # at least one item is necessary to be here
for cycle in range(int(raw_input("Number of lines: "))-1):
    line = []
    previous = pascal[-1]
    lenghtOfNew = len(previous) + 1
    for index in range(lenghtOfNew):
        if index == 0: # beging of new line
            element = pascal[-1][0]
        elif index == len(pascal[-1]): # end of line
            element = pascal[-1][index-1]
        else:
            element = pascal[-1][index-1] + pascal[-1][index]
        line.append(element)
    pascal.append(line)
 
for line in pascal:
    print line