Python Program to Print Left Pascals Star Triangle

Write a Python program to print left pascals star triangle using for loop. 

rows = int(input("Enter Left Pascals Star Triangle Pattern Rows = "))

print("====Left Pascals Star Triangle Pattern====")

for i in range(1, rows + 1):
    for l in range(i, rows):
        print(end = '  ')
    for m in range(1, i + 1):
        print('*', end = ' ')
    print()

for i in range(rows, 0, -1):
    for l in range(i, rows + 1):
        print(end = '  ')
    for m in range(1, i):
        print('*', end = ' ')
    print()
Python Program to Print Left Pascals Star Triangle

This Python program prints the left pascals star triangle using a while loop.

rows = int(input("Enter Left Pascals Star Triangle Pattern Rows = "))

print("====Left Pascals Star Triangle Pattern====")
i = 1
while(i <= rows):

    j = i
    while(j < rows):
        print(end = '  ')
        j = j + 1

    l = 1
    while(l <= i):
        print('*', end = ' ')
        l = l + 1
    print()
    i = i + 1

i = rows
while(i >= 1):
    j = i
    while(j <= rows):
        print(end = '  ')
        j = j + 1

    l = 1
    while(l < i):
        print('*', end = ' ')
        l = l + 1
    print()
    i = i - 1
Enter Left Pascals Star Triangle Pattern Rows = 7
====Left Pascals Star Triangle Pattern====
            * 
          * * 
        * * * 
      * * * * 
    * * * * * 
  * * * * * * 
* * * * * * * 
  * * * * * * 
    * * * * * 
      * * * * 
        * * * 
          * * 
            * 

In this Python example, we used the pyLeftPascalStar function to display the left pascals triangle pattern of a given character.

def pyLeftPascalsStar(rows, ch):
    for i in range(1, rows + 1):
        for l in range(i, rows):
            print(end = '  ')
        for m in range(1, i + 1):
            print('%c' %ch, end = ' ')  
        print()

    for i in range(rows, 0, -1):
        for l in range(i, rows + 1):
            print(end = '  ')
        for m in range(1, i):
            print('%c' %ch, end = ' ')  
        print()

rows = int(input("Enter Left Pascals Star Triangle Pattern Rows = "))
ch = input("Symbol to use in Sandglass Pattern = " )

print("====Left Pascals Star Triangle Pattern====")
pyLeftPascalsStar(rows, ch)
Enter Left Pascals Star Triangle Pattern Rows = 10
Symbol to use in Sandglass Pattern = $
====Left Pascals Star Triangle Pattern====
                  $ 
                $ $ 
              $ $ $ 
            $ $ $ $ 
          $ $ $ $ $ 
        $ $ $ $ $ $ 
      $ $ $ $ $ $ $ 
    $ $ $ $ $ $ $ $ 
  $ $ $ $ $ $ $ $ $ 
$ $ $ $ $ $ $ $ $ $ 
  $ $ $ $ $ $ $ $ $ 
    $ $ $ $ $ $ $ $ 
      $ $ $ $ $ $ $ 
        $ $ $ $ $ $ 
          $ $ $ $ $ 
            $ $ $ $ 
              $ $ $ 
                $ $ 
                  $ 

About Suresh

Suresh is the founder of TutorialGateway and a freelance software developer. He specialized in Designing and Developing Windows and Web applications. The experience he gained in Programming and BI integration, and reporting tools translates into this blog. You can find him on Facebook or Twitter.