How to Print Pascal Triangle with Given Rows in Python


This example will teach us how to print the Pascal triangle of the given number of rows in Python.

Source Code

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

n = int(input("Enter the number of rows: "))
a = [[0 for row in range(0, n)] for col in range(0, n)]
for i in range(0, n):
    for j in range(0, n):
        if j == 0 or j == i:
            a[i][j] = 1
        else:
            a[i][j] = a[i - 1][j - 1] + a[i - 1][j]

for i in range(0, n):
    print("   "*(n - i), end=" ", sep=" ")
    for j in range(0, i+1):
        print("{0:5}".format(a[i][j]), end=" ", sep=" ")
    print()

Output:

Enter the number of rows: 4
                 1
              1     1
           1     2     1
        1     3     3     1

Enter the number of rows: 6
                       1
                    1     1
                 1     2     1
              1     3     3     1
           1     4     6     4     1
        1     5    10    10     5     1
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