(三)3-1 练习

1. 把一个数字的list从小到大排序，然后写入文件，然后从文件中读取出来文件内容，然后反序，在追加到文件的下一行中
2. 分别把 string， list， tuple， dict写入到文件中

#!/usr/bin/env python 
#coding:utf8

import  random
import codecs
def getList():
    l = []
    for i in range(10):
        num = random.randint(1,100)
        l.append(num)
    l.sort(reverse=False)
    print("随机生成的列表由小到大排序:{0}".format(l))
    return  l

def wFile(l,mode):
    with codecs.open("testList.txt",'{0}b'.format(mode)) as fd:
        if mode == "a":
            fd.write('
')
        fd.write("{0}".format(l))
def rFile():
    with codecs.open("testList.txt",'rb') as fd:
        for line in fd.readlines():
            newL = line.lstrip('[').rstrip(']').split(',')
            newList = [int(i) for i in newL]
            newList.sort(reverse=True)
            print("反序后的列表是：{0}".format(newList))
    wFile(newList,'a')

string1 = "123456789,hello world !"
print(type(string1))
list1 = ['a','b','c']
print(type(list1))
tuple1 = (1,2,"abc","efc")
print(type(tuple1))
dict1 = {"name":"cnblogs","age":"20"}
print(type(dict1))

if __name__=="__main__":
    l = getList()
    wFile(l,'w')
    rFile()
    print("分别把 string， list， tuple， dict写入到文件中")
    wFile(string1,"a")
    wFile(list1,"a")
    wFile(tuple1,"a")
    wFile(dict1,"a")

代码运行结果：

<type 'str'>
<type 'list'>
<type 'tuple'>
<type 'dict'>
随机生成的列表由小到大排序:[30, 46, 53, 53, 55, 65, 68, 83, 84, 95]
反序后的列表是：[95, 84, 83, 68, 65, 55, 53, 53, 46, 30]
分别把 string， list， tuple， dict写入到文件中

最终testList.txt写入的内容

[30, 46, 53, 53, 55, 65, 68, 83, 84, 95]
[95, 84, 83, 68, 65, 55, 53, 53, 46, 30]
123456789,hello world !
['a', 'b', 'c']
(1, 2, 'abc', 'efc')
{'age': '20', 'name': 'cnblogs'}