Python Program to Print (Generate) Christmas Tree Pattern

This python program prints Christmas tree pattern made up of stars up to n lines.

In this python example, we first read number of row in Christmas tree pattern from user using built-in function input(). Since function input() returns string value, we need to convert given number to number type using int(). And then we generate Christmas tree pattern using python's for loop.

Note: Here row number indicates number of row in each section in pattern. If we give input row number 7 then total row will be 21 :)

Python Source Code: Christmas Tree Pattern

# Python Program to Generate Christmas Tree Pattern

# Generating Triangle Shape
def triangleShape(n):
    for i in range(n):
        for j in range(n-i):
            print(' ', end=' ')
        for k in range(2*i+1):
            print('*',end=' ')
        print()

# Generating Pole Shape
def poleShape(n):
    for i in range(n):
        for j in range(n-1):
            print(' ', end=' ')
        print('* * *')

# Input and Function Call
row = int(input('Enter number of rows: '))

triangleShape(row)
triangleShape(row)
poleShape(row)

In this program print() only is used to bring control to new lines.

Output

Enter number of rows: 7

              * 
            * * * 
          * * * * * 
        * * * * * * * 
      * * * * * * * * * 
    * * * * * * * * * * * 
  * * * * * * * * * * * * * 
              * 
            * * * 
          * * * * * 
        * * * * * * * 
      * * * * * * * * * 
    * * * * * * * * * * * 
  * * * * * * * * * * * * * 
            * * *
            * * *
            * * *
            * * *
            * * *
            * * *
            * * *