Python pattern programming part 1

 

Various pattern programming in python using for loop.

Pattern 1:

This pattern will print a triangle of stars with a height equal to the input number.

python
n = int(input("Enter the number of rows: "))


for i in range(1, n+1):
    
print("*" * i)

Output for n = 5:

python
*

**

***

****

*****

Pattern 2:

This pattern will print a hollow rectangle of stars with a width and height equal to the input numbers.

python
width = int(input("Enter the width: "))

height = int(input("Enter the height: "))


for i in range(height):
    
    if i == 0 or i == height-1:
        
        print("*" * width)
    
    else:
        
        print("*" + " "*(width-2) + "*")

Output for width = 5 and height = 4:

python
*****

*     *

*   *

*****

Pattern 3:

This pattern will print a diamond of stars with a width equal to the input odd number.

python
n = int(input("Enter the odd number of rows: "))


for i in range(n):
    
    if i <= n//2:
        
        print(" "*(n//2-i) + "*"*(2*i+1))
    
    else:
        
        print(" "*(i-n//2) + "*"*(2*(n-i)-1))

Output for n = 7:

python
   *
  
  ***

 *****
*******
 
 *****
  
  ***

   *

Pattern 4:

This pattern will print a staircase of numbers with a height equal to the input number.

python
n = int(input("Enter the number of rows: "))


for i in range(1, n+1):
    
    for j in range(1, i+1):
        
        print(j, end="")
    
    print()

Output for n = 5:

python
1

12

123

1234

12345

Pattern 5:

This pattern will print a pyramid of numbers with a height equal to the input number.

python
n = int(input("Enter the number of rows: "))


for i in range(1, n+1):
    
    print(" "*(n-i), end="")
    
    for j in range(1, i+1):
        
        print(j, end="")
    
    for k in range(i-1, 0, -1):
        
        print(k, end="")
    
    print()

Output for n = 5:

python
     1

    121

   12321

  1234321

 123454321

I hope you find these examples helpful!