1.下三角

for i in range(10):
    print('* ' * (10-i))

* * * * * * * * * * 
* * * * * * * * * 
* * * * * * * * 
* * * * * * * 
* * * * * * 
* * * * * 
* * * * 
* * * 
* * 
* 

2.倒三角

for i in range(10):
    print(' ' * i + '* ' * (10-i))

* * * * * * * * * * 
 * * * * * * * * * 
  * * * * * * * * 
   * * * * * * * 
    * * * * * * 
     * * * * * 
      * * * * 
       * * * 
        * * 
         * 

3.聖誕樹

for i in range(5):
    print(' ' * (5-i+1) + '* ' * (i+1)) 
for i in range(5, 9):
    print(' ' * (9-i-1) + '* ' * (i-1))  
for i in range(9, 13):
    print(' ' * 4 + '* ' * 3)   

      * 
     * * 
    * * * 
   * * * * 
  * * * * * 
   * * * * 
  * * * * * 
 * * * * * * 
* * * * * * * 
    * * * 
    * * * 
    * * * 
    * * * 

4.乘法口訣表

for i in range(1, 10):
    for j in range(0, i):
        print(str(i)+'x'+str((j+1))+'='+str(i*(j+1)), end=' ')
    print('')

1x1=1 
2x1=2 2x2=4 
3x1=3 3x2=6 3x3=9 
4x1=4 4x2=8 4x3=12 4x4=16 
5x1=5 5x2=10 5x3=15 5x4=20 5x5=25 
6x1=6 6x2=12 6x3=18 6x4=24 6x5=30 6x6=36 
7x1=7 7x2=14 7x3=21 7x4=28 7x5=35 7x6=42 7x7=49 
8x1
 
=8 8x2=16 8x3=24 8x4=32 8x5=40 8x6=48 8x7=56 8x8=64 
9x1=9 9x2=18 9x3=27 9x4=36 9x5=45 9x6=54 9x7=63 9x8=72 9x9=81