python 10月30日复习

Posted 2020-10-12

 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

import codecs

list1 = [2,23,8,54,86,12]
list1.sort()

with codecs.open(‘1.txt‘,‘wb‘) as f:
    f.write(str(list1))


with codecs.open(‘1.txt‘,‘rb‘) as f:
    print (f.read())


list1.reverse()
with codecs.open(‘1.txt‘,‘ab‘) as f:
    f.write(‘\\n‘)
    f.write(str(list1))


with codecs.open(‘1.txt‘,‘rb‘) as f:
    print (f.read())

　　程序运行结果：

 

2.分别把 string， list， tuple， dict写入到文件中

import codecs

string = ‘abc‘
li = [‘aa‘,‘bb‘,‘cc‘,‘dd‘]
tu = (‘ee‘,‘ff‘,‘gg‘,‘hh‘)
di = {"name":"huangdongju","age":20 }

with codecs.open(‘2.txt‘,‘wb‘) as file:
    file.write(string+‘\\n‘)
    file.write(str(li)+‘\\n‘)
    file.write(str(tu)+‘\\n‘)
    file.write(str(di))

with codecs.open(‘2.txt‘,‘rb‘) as file:
    print (file.read())

程序运行结果：