alphabet_ragnoli.py

def print_rangoli(size):
    central = ''
    for i in range(size-1, 0, -1):
        central = central + chr(int(ord('a') + i)) + '-'
    
    central = central + chr(int(ord('a') + 0)) + central[::-1]
    width = len(central)
    
    p = ''
    for j in range(size-1, -1, -1):
        s = ''
        for i in range(size-1, j, -1):
            s = s + chr(int(ord('a') + i)) + '-'
            
        line = s + chr(int(ord('a') + j)) + s[::-1]
        line = line.center(width, '-')
        if j != 0:
            p = p + line + '\n'
        
    print (p + central + p[::-1])