如何打印出想要的图案

def diamond(side_len):
    for i in range(1, side_len + 1, 2):
        print((i * '*').center(side_len, ' '))
    for i in reversed(range(1, side_len, 2)):
        print((i * '*').center(side_len, ' '))


if __name__ == '__main__':
    diamond(7)

#!/usr/bin/python
# -*- coding: UTF-8 -*-

from sys import stdout
for i in range(4):
    for j in range(2 - i + 1):
        stdout.write(' ')
    for k in range(2 * i + 1):
        stdout.write('*')
    print

for i in range(3):
    for j in range(i + 1):
        stdout.write(' ')
    for k in range(4 - 2 * i + 1):
        stdout.write('*')
    print