python 复习-2

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件内容,然后反序,再追加到文件的下一行中

"""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件内容,然后反序,再追加到文件的下一行中"""
import codecs

list1 = [32, 43, 12, 10, 5, 100, 120 ,110 ,119, 300, 250]

# list从小到大排序
list1.sort()

# 将list写入文件
with codecs.open('Exercise.txt', 'wb') as file1:
    for i in xrange(0, len(list1)):
        file1.write(str(list1[i]))
        if i != len(list1) - 1:
            file1.write(',')

# 从文件读取内容,并反序
with codecs.open('Exercise.txt') as file1:
    text = file1.read()
text_list = text.strip(',').split(',')
text_list.reverse()

# 将结果追加到文件下一行中
with codecs.open('Exercise.txt', 'ab') as file1:
    file1.write('\n')
    for i in xrange(0, len(text_list)):
        file1.writelines(str(text_list[i]))
        if i != len(text_list) - 1:
            file1.write(',')

执行后文件内容:

5,10,12,32,43,100,110,119,120,250,300
300,250,120,119,110,100,43,32,12,10,5

分别把string list tuple dict 写入到文件中

"""分别把string list tuple dict 写入到文件中"""

string = 'This is a string'
list1 = ['This', 'is', 'a', 'list']
tuple1 = ('This', 'is', 'a', 'tuple')
dict1 = {'This':'is', 'a':'dict'}

with codecs.open('Exercise.txt', 'wb') as ff:
    ff.write(string + '\n')
    ff.write(str(list1) + '\n')
    ff.write(str(tuple1) + '\n')
    ff.write(str(dict1) + '\n')
    ff.write('##' * 20 + '\n')

    ff.write(string + '\n')

    for i in xrange(0, len(list1)):
        ff.write(list1[i] + ' ')
    ff.write('\n')

    for i in xrange(0, len(tuple1)):
        ff.write(tuple1[i] + ' ')
    ff.write('\n')

    for key, values in dict1.iteritems():
        ff.write(key +  ' ' + values + ' ')
    ff.write('\n')

写入的文件内容:

This is a string
['This', 'is', 'a', 'list']
('This', 'is', 'a', 'tuple')
{'This': 'is', 'a': 'dict'}
########################################
This is a string
This is a list
This is a tuple
This is a dict