图案形成：
练习：

1)

for row in range(5):
    for col in range(5-row):
        print(5-col,end=' ')
    print()

输出：

5 4 3 2 1 
5 4 3 2 
5 4 3 
5 4 
5 

2)

no = 1
for row in range(5): 
    for col in range(5-row):
        print(no, end=' ')
        no+=1
    print()

输出：

1 2 3 4 5 
6 7 8 9 
10 11 12 
13 14 
15 

3)

for row in range(5): 
    for col in range(5-(row+1)):
        print(col+1, end=' ')
    print()

输出：

1 2 3 4 
1 2 3 
1 2 
1 

4)

for row in range(5): 
    for col in range(4-row):
        print(col+1, end=' ')
    print("* ", end= ' ')
    print()

输出：

1 2 3 4 *  
1 2 3 *  
1 2 *  
1 *  
*  

5)

for row in range(5): 
    for col in range(4-row):
        print(col+1, end=' ')
    for col in range(5):
        print("* ",end=' ')
    print()

输出：

1 2 3 4 *  *  *  *  *  
1 2 3 *  *  *  *  *  
1 2 *  *  *  *  *  
1 *  *  *  *  *  
*  *  *  *  *  

6)

for row in range(5): 
    for col in range(4-row):
        print(col+1, end=' ')
    for col in range(5):
        print(col,end=' ')
    print()

输出：

1 2 3 4 0 1 2 3 4 
1 2 3 0 1 2 3 4 
1 2 0 1 2 3 4 
1 0 1 2 3 4 
0 1 2 3 4 

7)

for row in range(5): 
    for col in range(4-row):
        print(" ", end=' ')
    for col in range(row+1):
        print(col+1,end=' ')
    print()

输出：

        1 
      1 2 
    1 2 3 
  1 2 3 4 
1 2 3 4 5 

8)

for row in range(5): 
    for col in range(4-row):
        print("", end=' ')
    for col in range(row+1):
        print(col+1,end=' ')
    print()

输出：

    1 
   1 2 
  1 2 3 
 1 2 3 4 
1 2 3 4 5 

9)

for row in range(5): 
    for col in range(4-row):
        print(" ", end=' ')
    for col in range(5):
        print(col+1,end=' ')
    print()

输出：

        1 2 3 4 5 
      1 2 3 4 5 
    1 2 3 4 5 
  1 2 3 4 5 
1 2 3 4 5 

10)

for row in range(5): 
    for col in range(row+1):
        print(col+1,end=' ')
    print()

输出：

1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 

11)

for row in range(5): 
    for star in range(4-row):
        print("*",end=' ')
    for col in range(row+1):
        print(col+1,end=' ')
    print()

输出：

* * * * 1 
* * * 1 2 
* * 1 2 3 
* 1 2 3 4 
1 2 3 4 5 

12)

for row in range(5): 
    for star in range(4-row):
        print(" ",end=' ')
    for col in range(row+1):
        print(5-col,end=' ')
    print()

输出：

        5 
      5 4 
    5 4 3 
  5 4 3 2 
5 4 3 2 1 

13)

for row in range(5): 
    for space in range(4-row):
        print(' ',end=' ')
    for col in range(row+1):
        print(5+col-row,end=' ')
    print()

输出：

        5 
      4 5 
    3 4 5 
  2 3 4 5 
1 2 3 4 5 

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