!pip install jovian --upgrade --quiet

line = '*'
while len(line) <= 20:
    print(line)
    line = line + '**'

# diamond like shape
    

# triangle shape
line = '*'
while len(line) <= 20:
    print(line)
    line = line + '*'
    
while len(line) > 0:
    print(line)
    line = line[:-1]