Print Pascal’s triangle in Python

In this tutorial, we will learn how to print Pascal’s triangle in Python.

Pascal Triangle in Python- “Algorithm”

Now let us discuss the algorithm for printing Pascal’s triangle in Python.
Steps involved:
1. Two nested loops must be used to print the pattern in 2-D format.
2. The number of elements in each row is equal to the number of rows.
3. The number of spaces must be (total of rows – current row’s number) #in case we want to print the spaces as well to make it look more accurate and to the point.

Source Code – Pascal Triangle in Python

def printPascal(n):
    for line in range(1, n + 1):
        C = 1  # Initializing the value of C for the first element in the line
        for i in range(1, line + 1):
            print(C, end=" ")  # Printing the value of C followed by a space
            C = C * (line - i) // i  # Calculating the next value of C
        print()  # Moving to the next line

n = 5
printPascal(n)

The above code declares a function named printPascal which contain two nested loop. The outer loop starts from 1 and terminates at n and the inner loop starts from 1 to till the counter of the outer loop. The variable C contains the series of numbers to be printed. The outer loop contains escape sequence “\n” which makes it to the next line after each iteration.

Output:

1 

1 1 

1 2 1 

1 3 3 1 

1 4 6 4 1 

Also, check out these for a wider grasping of knowledge:

• How to Print Lower Triangle Pattern using Python
• Matrix Transpose of a given Matrix of any dimension in Python