Diamond Pattern

rows = 4
i = 1

# Top Half
while i <= rows:
    j = rows
    
    while j > i:
        print(end=" ")
        j -= 1 
        
    print("*", end =" ")
         
    k = 1
          
    while k < 2 * (i-1):
        print(end=" ")
        k += 1
        
    if i == 1:
        print()
    else:
        print("*")
        
    i +=1

# Bottom Half
    
i = rows - 1

while i >= 1:
    j = rows
    
    while j > i:
        print(end=" ")
        j -= 1 
        
    print("*", end =" ")
         
    k = 1
          
    while k < 2 * (i-1):
        print(end=" ")
        k += 1
        
    if i == 1:
        print()
    else:
        print("*")
        
    i -= 1

Run