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Python 3 | Program to print double sided stair-case pattern

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  • Difficulty Level : Expert
  • Last Updated : 04 Jun, 2022
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Below mentioned is the python 3 program to print the double sided stair case pattern. Examples:

Input : 10
Output :

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

Note : This code only works for even values of n. 

Python3




# Python3 Program to demonstrate
# staircase pattern
 
# function definition
def pattern(n):
 
    # for loop for rows
    for i in range(1,n+1):
 
        # conditional operator
        k =i + 1 if(i % 2 != 0) else i
 
        # for loop for printing spaces
        for g in range(k,n):
            if g>=k:
                print(end="  ")
 
        # according to value of k carry
        # out further operation
        for j in range(0,k):
            if j == k - 1:
                print(" * ")
            else:
                print(" * ", end = " ")
 
 
# Driver code
n = 10
pattern(n)

Output:

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

Time Complexity: O(n2), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

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