Python 文件的练习

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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

#从小到大排序import codecslist1 = [1,3,8,5,2]list1.sort()

#写入文件换行写在文件中

import codecslist1 = [1,3,8,5,2]list1.sort()f = codecs.open('training01.txt','wb')for i in list1:    f.write(str(i))    f.write('\n')f.close()

#反序

list1 = [1,3,8,5,2]list1.sort()list1.reverse()

#追加反序

import codecslist1 = [1,3,8,5,2]list1.sort()f = codecs.open('training01.txt','wb')for i in list1:    f.write(str(i))    f.write('\n')f.close()list1.reverse()b = list1#print bw = codecs.open('training01.txt','ab')for i in b:    w.write('\n')    w.write(str(i))w.close()

#整理一个文件

import codecslist1 = [1,3,8,5,2]list1.sort()f = codecs.open('training01.txt','wb')                  # 把列表写入文件for i in list1:    f.write(str(i))    f.write('\n')f.close()                    list1.reverse()b = list1#print bw = codecs.open('training01.txt','ab')                  #把列表反转追加到文件中for i in b:    w.write('\n')    w.write(str(i))w.close()str1 = 'abcd'                                           #追加字符串w = codecs.open('training01.txt','ab')for i in str1:    w.write(str(i))w.close()tub = (1,2,'a','b','c')                                 #追加元组with codecs.open('training01.txt','ab') as w:    w.write('\n')    for i in tub:        w.write(str(i))dic1 = {1:2,'a':123}                                    #追加字典with codecs.open('training01.txt','ab') as w:    w.write('\n')    for d in dic1.iteritems():        w.write('\n')        for i in d:            w.write(str(i))

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