s = '*'
for i in range(1, 8, 2):
print((s*i).center(7))
for i in reversed(range(1, 6, 2)):
print((s*i).center(7))
2、使用普通方法
#coding:utf-8
rows = int(input('输入列数： '))
i = j = k = 1
#声明变量,i用于控制外层循环（图形行数），j用于控制空格的个数，k用于控制*的个数
#打印菱形
print("打印空心等菱形，这里去掉if-else条件判断就是实心的")
for i in range(rows):
for j in range(rows - i):
print(" ", end=" ")
j += 1
for k in range(2 * i - 1):
if k == 0 or k == 2 * i - 2:
print("*", end=" ")
else:
print(" ", end=" ")
k += 1
print ("\n")
i += 1
#菱形的下半部分
for i in range(rows):
for j in range(i):
#(1,rows-i)
print(" ", end=" ")
j += 1
for k in range(2 * (rows - i) - 1):
if k == 0 or k == 2 * (rows - i) - 2:
print("*", end=" ")
else:
print(" ", end=" ")
k += 1
print("\n")
i += 1
