python3 while循环嵌套中的问题 打印倒三角型

Question

1，打印一个三角形，使用while，完成以下图形的输出** ** * ** * * ** * * * ** * * ** * ** **代码如下：h=1while h<=5:    w=1    while w<=h:        print("x",end="")        w+=1    print("")    h+=1h=5while h>=1:    w=5    while w>=h:        print("x",end="")        w-=1    print("")        h-=1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx可我打印的结果是这样，我实在想不明白怎么让第6行依次减少一个X请高手解答！谢谢！

Answer 1

i=1 while i<=5: j=1 while j<=i: print('*',end='') j+=1 print() i+=1 i=1 while i<=4: j=4 while j>=i: print('*',end='') j-=1 print() i+=1

Answer 2

def print_pic(num):

  print ''.join(['*'] * num)

i = 1

h = 5

while i <= (2 * h - 1):

  print_pic(i if i <= h else (2 * h - i))

  i = i + 1

i = 1

h = 5

while i <= (2 * h - 1):

  if i <= h:

    print ''.join(['*'] * i)

  else:

    print ''.join(['*'] * (2 * h - i))

  i = i + 1

# 递归

def print_pic(num, index=1):

  count = index if index <= num else 2 * num - index

  print ''.join(['*'] * count)

  if index > 2 * num - 1:

    return

  print_pic(num, index=index+1)

print_pic(5)