1、Python列表排序 reverse、sort、sorted 操作方法詳解

reverse（倒序/反轉）

>>>

>>> x=[1,2,3,4]

>>> x.reverse()

>>> print x

[4, 3, 2, 1]

>>>

sort(正序/小到大)

>>>

>>> y=[0,5,2,7]

>>> y.sort()

>>> print y

[0, 2, 5, 7]

>>>

sorted(即可以保留原列表，又能得到已經排序好的列表)

>>> z=[1,3,5,2,4]

>>> a=sorted(z)

>>> print z

[1, 3, 5, 2, 4]

>>> print a

[1, 2, 3, 4, 5]

>>>

輸入的數字按小到大排序

[root@python ~]# cat a.py

#!/usr/bin/python
#-*- coding:utf-8 -*-
number1=int(raw_input("please input your number:"))
number2=int(raw_input("please input your number:"))
number3=int(raw_input("please input your number:"))
number=[number1,number2,number3]
number.sort()
print number

結果：

[root@python ~]# python a.py

please input your number:5
please input your number:2
please input your number:6
[2, 5, 6]

2、計算1到100內的奇數和

解法1

#!/usr/bin/python
#-*- coding: utf-8 -*-
i=1
sum=0
while(i<100):
sum=sum+i
i=i+2
print sum

解法2

#!/usr/bin/python
#-*- coding: utf-8 -*-
i=1
sum=0
while(i<100):
if (i % 2 ==1):
sum=sum+i
i=i+2
print sum

結果：2500

同理-------------------

計算1到100內的偶數和

#!/usr/bin/python
a=0
sum=0
while(a<=100):
        sum=sum+a
        a=a+2
print sum

結果：2550

3、九九乘法表

[root@python ~]# cat a.py

#!/usr/bin/python
i = 1
while (i<=9):
        j=1
        while (j<=i):
                print j,"x",i,"=", j*i, "\t ",
                j+=1
        print " "
        i+=1

結果：

[root@python ~]# python a.py

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

Python--小題練習