Python学习笔记【二】

Python的冒泡排序：

 

#!/usr/bin/python
# -*- coding: UTF-8 -*-

x = xrange(0,8)
print x[0]
print x[7]
def bubbleSort(numbers):
    for j in xrange(len(numbers) - 1,-1,-1):
        for i in xrange(j):
            if numbers[i] > numbers[i+1]:
                numbers[i],numbers[i+1]=numbers[i+1],numbers[i]
            print numbers
            
def main():
    numbers=[23,12,9,15,6]
    bubbleSort(numbers)
if __name__=='__main__':
    main()

 Python的基本数据结构：

1.元组 

元组:range([start],stop,[step])

       map(function,sequence[,sequence,...])#if function==None :map()返回一个由参数sequence组成的元组或列表

#!/usr/bin/python
# -*- coding: UTF-8 -*-

tuple = ("apple", "banana", "grape", "orange")
print tuple[-1]
print tuple[-2]
tuple2 = tuple[1:3]
tuple3 = tuple[0:-2]
tuple4 = tuple[2:-2]
print tuple2
print tuple3
print tuple4

fruit1 = ("apple", "banana")
fruit2 = ("grape", "orange")
tuple = (fruit1, fruit2)
print tuple
print "tuple[0][1] =",tuple[0][1]
print "tuple[1][1] =",tuple[1][1]
#print tuple[1][2]

#打包
tuple = ("apple", "banana", "grape", "orange")
#解包
a, b, c, d = tuple
print a, b, c, d


    

 

元组的只读性：

 

#!/usr/bin/python
# -*- coding: UTF-8 -*-

tuple = ("apple", "banana", "grape", "orange")
#tuple[0] = "a"   #错误  元组只读的。
#t = ("apple",)
#t = ()
print tuple[0]
print tuple[-1]
print tuple[-2]
#print t[0]   #错误 越界

 元组的遍历：

 

#!/usr/bin/python
# -*- coding: UTF-8 -*-

#使用range()循环遍历
tuple = (("apple", "banana"),("grape", "orange"),("watermelon",),("grapefruit",))
for i in range(len(tuple)):
    print "tuple[%d] :" % i, "" ,
    for j in range(len(tuple[i])):
        print tuple[i][j], "" ,
    print

#使用map()循环遍历  map解包
k = 0
for a in map(None,tuple):
    print "tuple[%d] :" % k, "" ,
    for x in a:
        print x, "" , 
    print
    k += 1

 

 

 

---

 2.列表

#!/usr/bin/python
# -*- coding: UTF-8 -*-

list = ["apple", "banana", "grape", "orange"]
print list
print list[2]
list.append("watermelon")
list.insert(1, "grapefruit")
print list
list.remove("grape")
print list
#list.remove("a")
print list.pop()
print list

list = ["apple", "banana", "grape", "orange"]
print list[-2]
print list[1:3]
print list[-3:-1]
list = [["apple", "banana"],["grape", "orange"],["watermelon"],["grapefruit"]]
for i in range(len(list)):
    print "list[%d] :" % i, "" ,
    for j in range(len(list[i])):
        print list[i][j], "" ,
    print

#################################运行结果#####################################
['apple', 'banana', 'grape', 'orange']
grape
['apple', 'grapefruit', 'banana', 'grape', 'orange', 'watermelon']
['apple', 'grapefruit', 'banana', 'orange', 'watermelon']
watermelon
['apple', 'grapefruit', 'banana', 'orange']
grape
['banana', 'grape']
['banana', 'grape']
list[0] :  apple  banana 
list[1] :  grape  orange 
list[2] :  watermelon 
list[3] :  grapefruit 

 

其它：

function()可以返回多个值