1、写函数，给定符号和行数，如’*’，5，可打印相应行数的如下图形：



In [4]:

    
def print_s(symbol,line):
    for i in range(line):
        if i == 0:
            print (' '*(line*2-i)+symbol*(i+1))
        else:
            print (' '*(line*2-i)+symbol*(2*i+1))
        
symbol = input('please input symbol: ')
line = int(input('please iput line: '))
print_s(symbol,line)









    



please input symbol: *
please iput line: 5
          *
         ***
        *****
       *******
      *********

打印如下9*9 乘法口诀表，注意每列左侧竖向对齐。



In [6]:

    
def print_():
    for i in range(1,10):
        for j in range(1,i+1):
              print (i,'*',j,'=',i*j,' ', end= ' ')
        print ()

print_()









    



1 * 1 = 1   
2 * 1 = 2   2 * 2 = 4   
3 * 1 = 3   3 * 2 = 6   3 * 3 = 9   
4 * 1 = 4   4 * 2 = 8   4 * 3 = 12   4 * 4 = 16   
5 * 1 = 5   5 * 2 = 10   5 * 3 = 15   5 * 4 = 20   5 * 5 = 25   
6 * 1 = 6   6 * 2 = 12   6 * 3 = 18   6 * 4 = 24   6 * 5 = 30   6 * 6 = 36   
7 * 1 = 7   7 * 2 = 14   7 * 3 = 21   7 * 4 = 28   7 * 5 = 35   7 * 6 = 42   7 * 7 = 49   
8 * 1 = 8   8 * 2 = 16   8 * 3 = 24   8 * 4 = 32   8 * 5 = 40   8 * 6 = 48   8 * 7 = 56   8 * 8 = 64   
9 * 1 = 9   9 * 2 = 18   9 * 3 = 27   9 * 4 = 36   9 * 5 = 45   9 * 6 = 54   9 * 7 = 63   9 * 8 = 72   9 * 9 = 81

写函数，可检查一个数（2-100000之间整数）能不能表示成两个质数之和，如果能，则打印这两个质数。主程序用18及93887分别做测试。



In [ ]:

    
#质数？

4、有一个列表：[1, 2, 3, 4…n]，n=20；请编写代码打印如下规律的输出（不允许直接拷贝并直接打印作为答案，想象n可能是变量）：



In [8]:

    
def print_list(list_num):
    pre_list = [i for i in range(list_num)]
    for i in range(list_num):
        print (i+1,end = ' ')
        
            
            
list_num  = int(input('please input a number:'))            
print_list(list_num)









    



please input a number:5
1 





    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-4acae02530af> in <module>()
      8 
      9 list_num  = int(input('please input a number:'))
---> 10 print_list(list_num)

<ipython-input-8-4acae02530af> in print_list(list_num)
      4         print (i+1,end = ' ')
      5         for j in range (5):
----> 6             print ('['+list_num[i])
      7 
      8 

TypeError: 'int' object is not subscriptable