python中while循环打印星星的四种形状

#1.定义一个行计数器row = 1while row <= 5: #定义一个列计数器
 col = 1
 #开始循环
 while col <= row:
 print('*',end='')
 col += 1
 print('')
 row += 1

#1.定义一个行计数器row = 1while row <= 5: #定义一个列计数器
 col = 5
 #开始循环
 while col >= row:
 print('*',end='')
 col -= 1
 print('')
 row += 1

row = 1while row <= 5: # 行数，循环五次
 a = 1
 col = 1
 while a <= 5 - row: # a控制每行的空格数=5-行数，例如：第一行为5-1=4个空格
 print(' ', end='') # 不换行
 a += 1
 while col <= row: # col控制*的数量=行数
 print('*', end='')
 col += 1
 print()
 row += 1

row = 1while row <= 5: # 行数，循环五次
 a = 1
 col = 1
 while a <= row - 1: # a控制每行的空格数=5-行数，例如：第一行为5-1=4个空格
 print(' ', end='') # 不换行
 a += 1
 while col <= 6-row: # col控制*的数量=行数
 print('*', end='')
 col += 1
 print()
 row += 1