编写一个Python程序，使用for循环来打印空心沙漏星形图案。

rows = int(input("Enter Hollow Sandglass Star Pattern Rows = "))
print("====The Hollow Sandglass Star Pattern====")
for i in range(1, rows + 1):
    for j in range(1, i):
        print(end = ' ')
    for k in range(i, rows + 1):
        if i == 1 or k == i or k == rows:
            print('*', end = ' ')
        else:
            print(end = '  ')
    print()
for i in range(rows - 1, 0, -1):
    for j in range(1, i):
        print(end = ' ')
    for k in range(i, rows + 1):
        if i == 1 or k == i or k == rows:
            print('*', end = ' ')
        else:
            print(end = '  ')      
    print()
Enter Hollow Sandglass Star Pattern Rows = 8
====The Hollow Sandglass Star Pattern====
* * * * * * * * 
* * * * * * * * 
在这个Python例子中，我们创建了一个函数，它将运行重复的for循环来打印空心沙漏星图案。
def hollowsandcheck(i, rows):
    for j in range(1, i):
        print(end = ' ')
    for k in range(i, rows + 1):
        if i == 1 or k == i or k == rows:
            print('*', end = ' ')
        else:
            print(end = '  ')
rows = int(input("Enter Hollow Sandglass Star Pattern Rows = "))
print("====The Hollow Sandglass Star Pattern====")
for i in range(1, rows + 1):
    hollowsandcheck(i, rows)
    print()
for i in range(rows - 1, 0, -1):
    hollowsandcheck(i, rows)    
    print()
这个Python程序使用while循环显示星星的空心沙漏图案。
def hollowsandcheck(i, rows):
    j = 1
    while(j < i):
        print(end = ' ')
        j = j + 1
    k = i
    while(k <= rows):
        if i == 1 or k == i or k == rows:
            print('*', end = ' ')
        else:
            print(end = '  ')
        k = k + 1
rows = int(input("Enter Hollow Sandglass Star Pattern Rows = "))
print("====The Hollow Sandglass Star Pattern====")
i = 1
while(i <= rows):
    hollowsandcheck(i, rows)
    print()
    i = i + 1
i = rows - 1
while(i >= 1):
    hollowsandcheck(i, rows)    
    print()
    i = i - 1
Enter Hollow Sandglass Star Pattern Rows = 10
====The Hollow Sandglass Star Pattern====
* * * * * * * * * * 
* * * * * * * * * * 
这个Python例子允许用户输入字符，并打印出给定字符的空心沙漏图案。
def hollowsandcheck(i, rows, ch): for j in range(1, i): print(end = ' ') for k in range(i, rows + 1): if i == 1 or k == i or k == rows: print('%c' %ch, end = ' ') else: print(end = ' ' )
def hollowsandcheck(i, rows, ch):
    for j in range(1, i):
        print(end = ' ')
    for k in range(i, rows + 1):
        if i == 1 or k == i or k == rows:
            print('%c' %ch, end = ' ')
        else:
            print(end = '  ')
rows = int(input("Enter Hollow Sandglass Star Pattern Rows = "))
ch = input("Symbol to use in Hollow Sandglass Pattern = " )
print("====The Hollow Sandglass Star Pattern====")
for i in range(1, rows + 1):
    hollowsandcheck(i, rows, ch)
    print()
for i in range(rows - 1, 0, -1):
    hollowsandcheck(i, rows, ch)    
    print()
Enter Hollow Sandglass Star Pattern Rows = 13
Symbol to use in Hollow Sandglass Pattern = @
====The Hollow Sandglass Star Pattern====
@ @ @ @ @ @ @ @ @ @ @ @ @ 
 @                     @ 
  @                   @ 
   @                 @ 
    @               @ 
     @             @ 
      @           @ 
       @         @ 
        @       @ 
         @     @ 
          @   @ 
          @   @ 
         @     @ 
        @       @ 
       @         @ 
      @           @ 
     @             @ 
    @               @ 
   @                 @ 
  @                   @ 
 @                     @ 
@ @ @ @ @ @ @ @ @ @ @ @ @
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